Birch (trees)

Words for birch (tree) (Betula) in Celtic languages:

Proto-Celtic *betwiyos / *betuyā = birch (tree)
Old Irish (Goídelc) beithe = birch (tree)
Irish (Gaeilge) beith = birch (tree)
Scottish Gaelic (Gàidhlig) beith [beh] = birch
Manx (Gaelg) beih = birch (tree)
Proto-Brythonic *bedu = birch (tree)
Middle Welsh (Kymraec) bedw = birch
Welsh (Cymraeg) bedw [ˈbɛdʊ / ˈbeːdu] = birch, birch grove; maypole; birch-rod
Old Cornish bedewen = birch
Cornish (Kernewek) besewen = birch
Middle Breton bezu = birch
Breton (Brezhoneg) bezv = birch

Etymology: from the Proto-Indo-European *gʷet- (resin, gum) [source], which is also the root of the English words cud and quid.

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, teanglann.ie, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Birch Trees

Oak (trees)

Words for oak (Quercus) in Celtic languages:

Proto-Celtic *daru [d̪ˠaɾʲ] = oak
Gaulish Dervo = used in placenames
Old Irish (Goídelc) dair [d̪ˠaɾʲ] = oak
Irish (Gaeilge) dair [d̪ˠuːnˠ] = oak
doire [ˈd̪ˠɛɾʲə] = oak-wood; wood, grove, thicket
Scottish Gaelic (Gàidhlig) dair [darʲ] = oak (archaic)
darach [darəx] = oak, oaken, made of oak; ship (poetic)
Manx (Gaelg) darragh = oak, oaken, oak grove, oak wood
darrag = oak, beam, cast (fishing), snood, hairline
darree = oak
Proto-Brythonic *dar [ˈdar] = oak tree
Middle Welsh (Kymraec) dar = oak
Welsh (Cymraeg) dâr [ˈdaːr] = oak tree, foremost warrior, leader, mighty lord
derwen [ˈdɛrwɛn] = oak tree
derw = oak trees
Old Cornish dar = oak
Cornish (Kernewek) dar [daːr / dæːr] = oak
derwen = oak tree
derw = oak trees
Old Breton dar / daeru = oak
Breton (Brezhoneg) derv = oak

Etymology: from the Proto-Indo-European *dóru (tree) [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, teanglann.ie, On-Line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

oak

Fields, Meadows and Pastures

There are a number of words for fields in Celtic languages. Some appear only or mainly in placenames. Here’s a selection:

Roman Camp

Old Irish (Goídelc) achad = expanse of ground; pasture, field; field of battle
Irish (Gaeilge) achadh [d̪ˠuːnˠ] = field (archaic, used mainly in placenames)
Scottish Gaelic (Gàidhlig) achadh [axəɣ] = field, plain, meadow; cornfield newly cut or ready for reaping

Etymology: unknown

Proto-Celtic *gortos = fence, enclosure, pen
Old Irish (Goídelc) gort = field, orchard, crop
Irish (Gaeilge) gort [ɡɔɾˠt̪ˠ] = (cultivated) field, orchard, (standing) crop
Scottish Gaelic (Gàidhlig) gort [gɔrˠʃd] = standing corn; enclosure; small field
Proto-Brythonic *gorθ = field
Welsh (Cymraeg) garth = field, close, enclosure, fold, pen, yard; fort
Cornish (Kernewek) gorth = field
Old Breton orth = field
Breton (Brezhoneg) garz = field

Etymology: from the Proto-Indo-European *ǵʰortós (enclosure, hedge) [source], which is also the root of words yard and garden in English, via the Proto-Germanic *gardaz (enclosure, court, yard, garden) [source].

Words marked with a * are reconstructions.

Irish (Gaeilge) machaire = plain; stretch of level ground, links, course; field
Scottish Gaelic (Gàidhlig) machair [maxɪrʲ] = extensive low-lying fertile plain, level country; extensive beach; ow and level part of a farm
Manx (Gaelg) magher = field, fertile land, campaign, chase, machar, sphere

Etymology: unknown

Proto-Celtic *rowesyā- = (field, open ground)
Old Irish (Goídelc) róe [r͈oːi̯] = battle-field, level piece of ground, fight, battle
Irish (Gaeilge) [rˠeː] = stretch of ground, level ground, field
Scottish Gaelic (Gàidhlig) raon [rˠɯːn] = field, (piece of) ground; plain; zone, area; field (of expertise); ambit
Manx (Gaelg) rheam = gamut, range, field, monarchy
Old Breton runt = mound
Breton (Brezhoneg) run = mound, hill

Etymology: from the Proto-Indo-European *Hrew(H)os (open space, field). The English words rustic and rural come from the same root, via Latin [source].

Proto-Celtic *kagyom = pen, enclosure
Gaulish cagiíun / *kagyom = enclosure
Old Irish (Goídelc) cai = field, orchard, crop
Proto-Brythonic *kaɨ = animal pen, enclosure, field
Middle Welsh (Kymraec) kay / kae = field, enclosure
Welsh (Cymraeg) cae [kaːɨ̯ / kai̯] = hedge, hedgerow, fence; field, enclosure; circle, sphere; barrier, obstruction
Cornish (Kernewek) ke = hedge, fence
Old Breton cai = hedge
Middle Breton quae = hedge
Breton (Brezhoneg) kae = hedge

Etymology: from the Proto-Indo-European *kagʰyóm (enclosure, hedge) [source], which is also the root of word hedge in English, via the Proto-Germanic *hagjō (hedge) [source].

Proto-Celtic *magos = plain, field
Gaulish *magos = field
Old Irish (Goídelc) mag [maɣ] = plain, field
ármag, árbach, ármach = field of slaughter, battlefield
Middle Irish (Gaoidhealg) magh = plain
Irish (Gaeilge) [mˠɑː / mˠæː] = plain
Scottish Gaelic (Gàidhlig) magh [mɤɣ] = level country, plain
Magh Meala = Land of (Milk and) Honey (in mythology)
Magh Meall = elysium
magh na bàire = the plain of battle
Manx (Gaelg) magh = plain
Welsh (Cymraeg) maes [maːɨ̯s / mai̯s] = field, open country
Cornish (Kernewek) mes = open country
Old Breton maes = countryside, outside
Breton (Brezhoneg) maez = countryside, open field, outside, wide

Etymology: possibly from the Proto-Indo-European *meǵh- (great) [source].

Proto-Celtic *klowni = meadow
Old Irish (Goídelc) clúain = meadow
Irish (Gaeilge) cluain = meadow
Scottish Gaelic (Gàidhlig) cluain [kl̪uən̪ʲ] = green field, pasture, meadow
Old Welsh clun = meadow, moor
Middle Welsh (Kymraec) clun = meadow, moor
Welsh (Cymraeg) clun [klɨːn / kliːn] = meadow, moor; brake, brushwood

Etymology: possibly from the Proto-Indo-European *klopni (wet).

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

Food

Words for food in Celtic languages.

Proto-Celtic *bētom = food
Old Irish (Goídelc) bíad / bïad [bʲiːa̯ð] = food
Irish (Gaeilge) bia [bʲiə] = food, substance
Scottish Gaelic (Gàidhlig) biadh [biəɣ] = food, fare, repast, viand, victual, feed, a meal
Manx (Gaelg) bee [biː] = diet, feed, food, nourishment, provisions
Proto-Brythonic *buɨd [ˈbuɨ̯d] = food
Middle Welsh (Kymraec) bwyt = food
Welsh (Cymraeg) bwyd [buːɨ̯d / bʊi̯d] = food, nourishment, meat, victuals, provisions
Old Cornish buit = food
Cornish (Kernewek) bos / boys [ˈbɔːz] = food, meal, fare
Middle Breton boet, bouet = food
Breton (Brezhoneg) boued = food, eat, edible, bait, flesh (of fish), marrow, pulp, substance

Etymology: from the Proto-Indo-European *gʷeyh₃tom, from *gʷeyh₃- (to live) [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, teanglann.ie, Fockleyreen: Manx – English Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Welsh Rarebit

Death

Words for death in Celtic languages.

Proto-Celtic *bāstom / bāssom = death
Old Irish (Goídelc) bás [baːs] = death
Irish (Gaeilge) bás [bˠɑːsˠ / bˠæːsˠ] = death
Scottish Gaelic (Gàidhlig) bàs [baːs] = death, decease, demise
Manx (Gaelg) baase [bɛːs] = death

Etymology: from the Proto-Indo-European *gʷeh₂- (to go) [source].

Sources: Wiktionary, Am Faclair Beag, On-Line Manx Dictionary, Teaglann.ie

Proto-Celtic *marwos = dead
Old Irish (Goídelc) marb = dead; mortified, insensible, spiritually dead; inanimate; stagnant (water)
Irish (Gaeilge) marbh [ˈmˠɑɾˠəvˠ / ˈmˠarˠuː / ˈmˠarˠu] = dead person, death, defunct
Scottish Gaelic (Gàidhlig) marbh [marav] = dead person, the dead
Manx (Gaelg) marroo = dead, lifeless, inanimate, glassy (look), muggy, dull, dud, stagnant, defunct, mortified, slaughtered, departed, deceased, killed, extinct
merriu = dead men, departed souls
Proto-Brythonic *marw = dead
Welsh (Cymraeg) marw = dead, deceased, inanimate
marwolaeth = death, decease, demise; suffering, tribulation; deadly plague or pestilence, fatal disease
Cornish (Kernewek) mernans = death
Breton (Brezhoneg) marv = death

Etymology: from Proto-Indo-European *mer- (to die, disappear) [source].

Sources: Wiktionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Proto-Celtic *ankus = death
Old Irish (Goídelc) éc = death
Irish (Gaeilge) éag = Death, numbness, powerlessness
Scottish Gaelic (Gàidhlig) eug [eːg] = death, Death, ghost, spectre
Middle Welsh (Kymraec) angheu = death
Welsh (Cymraeg) angau = death, decease, demise, annihilation, cessation, mortal danger
Old Cornish ancou = death
Cornish (Kernewek) ankow = death
Old/Middle Breton ancou = death
Breton (Brezhoneg) ankow = death

Etymology: from Proto-Indo-European *nek̂- (to perish, disappear) [source].

Sources: Wiktionary, Am Faclair Beag, On-Line Manx Dictionary, Teaglann.ie, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Age

Words for age in Celtic languages.

Proto-Celtic *aiwestom = age, lifetime, era
Old Irish (Goídelc) áes [aːi̯s] = age, years; stage, period; era; lifetime
Irish (Gaeilge) aois [iːʃ] = age, length of life; old age; period, era
Scottish Gaelic (Gàidhlig) aois [ɯːʃ] = age, old age, antiquity
Manx (Gaelg) eash = eon, age, century; oldness, old age
Proto-Brythonic *oɨs = age
Old Welsh oit = time, period
Welsh (Cymraeg) oed [oːɨ̯d / ɔi̯d] = time, period, space (of time); life-span; age
oes [ˈoes] = age, long indefinite period; century; time, day(s); epoch
Old Cornish huis= age
Cornish (Kernewek) oos / ooj = age, period, epoch, era
Old Breton oit = age
Middle Breton oet = age
Breton (Brezhoneg) oad = age

Etymology: from the Proto-Indo-European *h₂ey-w-es-to-, from *h₂ey- (age, eternity), which is also the root of the English words age and eon [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, teanglann.ie, Fockleyreen: Manx – English Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Languages and Tongues

Today we’re looking at the words for language and tongue and related things in Celtic languages.

Proto-Celtic *tangʷāss, tangʷāt = tongue
Old Irish (Goídelc) tengae [ˈtʲeŋɡe] = tongue, language
Irish (Gaeilge) teanga [ˈtʲaŋə / ˈtʲaŋɡə] = tongue, language
teangach = tongued, lingual, wordy, loquacious
teangachruthach = tongue-shaped, linguiform
teangaigh = to tongue (in music)
teangaire = interpreter
teangeolaí = linguist, expert in linguistics
teangeolaíocht = linguistics
Scottish Gaelic (Gàidhlig) teanga [tʲɛŋgə] = tongue, speech, spit (of land)
teangan = tongue
teangaidh = tongue, speech
teangach = abounding in tongues, loquacious, langued (in hearldry)
teangair = linguist, interpreter, orator, philologist
Manx (Gaelg) çhengey [ˈtʃɛnʲə] = bell-clapper, clasp, feather, strap-hinge; catch (of buckle); tongue; language, speech; utterance
çhengeyr çhyndaader = interpreter
çhengeyder = linguist
çhengoaylleeaght = linguistics
çhengey ny mayrey = mother tongue
daa-hengagh = bilingual
yl-çhengagh = polyglot
Proto-Brytonic *tau̯āt, *tavọd = tongue
Old Welsh tauawt = tongue, language
Middle Welsh (Kymraec) tauaut = tongue, language
Welsh (Cymraeg) tafod [ˈtavɔd / ˈtaːvɔd] = tongue, faculty of speech, power of expression; language, speech, dialect, accent
tafod aur = pleasant or witty talk, eloquence (“gold tongue”)
tafod bach = uvula
tafod cloch = clapper (of bell)
tafodiaeth = language, vernacular or native language, dialect, pronunciation, articulation, verbal expression
tafodi = to scold, rebuke, chide, berate, cheek, abuse (verbally), tongue (in music)
tafodiad = a scolding or berating, pronunciation
tafodwr = speaker, talker
Old Cornish tauot = language, tongue
Middle Cornish tawes = language, tongue
Cornish (Kernewek) taves = language, tongue
tavosa = to scold, tell off
tavosek = talkative, verbose
tavoseth = idiom, jargon
Old Breton tavod = tongue
Middle Breton teaut, teut = tongue
Breton (Brezhoneg) teod [ˈtɛwt] = tongue
teodel = oral
teodek = talkative, gossipy
teodyezh = speech, dialect, way of speaking
teodyezhañ = to speak
teodyezher = speaker

Etymology: from the Proto-Indo-European *dn̥ǵʰwéh₂s (tongue) [source].

Words from the same PIE root include: tongue and language in English, lingua (tongue, language) in Italian, язик [jɐˈzɪk] (tongue) in Ukrainian, and jazyk (tongue, language) in Czech and Slovak [source].

Proto-Celtic *yaxtī = language
Middle Irish (Gaoidhealg) icht = race, people, tribe; province, district
Proto-Brythonic *jeiθ, *i̯ekti = tongue
Middle Welsh (Kymraec) ieith, yeith = language, nation, race
Welsh (Cymraeg) iaith [jai̯θ] = language, tongue; people, nation, race, tribe
ieithiadur = grammar
ieithio = to pronounce, proclaim, express
ieithog = having language or several languages, multilingual, polyglot
ieithydd = one who has thorough knowledge or command of a language or languages, linguist, grammarian, philologist, interpreter, speark, poet
ieithyddiaeth = linguistics, philology, grammar
ieithgi = one who is interested in the study of language (rather than of literature), philologist
Cornish (Kernewek) yeth [eːθ / jeːθ] = tongue, language
yeth le-usys = minority language
yethador = grammar
yethel = linguistic
yethonieth = linguistics
yethor, yethores = linguist
Middle Breton yez = language
Breton (Brezhoneg) yezh [ˈjeːs] = language
yezhadur = grammar
yezhadurel = grammatical
yezhel = linguistic
yezher = speaker
unyezher = unilingual
divyezher = bilingual
liesyezher = polyglot

Etymology: from the Proto-Indo-European *yek- (to utter). It is uncertain if the Middle Irish word icht is cognate with the Brythonic words [source].

Words from the same PIE root include: joke and Yule in English, jul (Yule, Christmas) in Danish and Norwegian, juego (play, game, sport) in Spanish, and joc (game, play, dance) in Romanian [source].

Old Irish (Goídelc) bélrae [ˈbʲeːl͈re] = language, speech
bélrae Féne = legal language
bélrae na filed = acrane vocabulary, poetic language
Middle Irish (Gaoidhealg) bérla(e) = speech, language
Irish (Gaeilge) béarla = speech (archaic)
béarlachas = Anglicism
béarlagair = jargon
béarlamhail = having command of language, fluent (archaic)
Béarla [ˈbʲeːɾˠl̪ˠə] = English (language)
Béarlóir = English speaker
Béarlóireacht = (act of) speaking English
Scottish Gaelic (Gàidhlig) Beurla [bjɤːr̪ˠl̪ˠə] = English (language)
Beurlachas = Anglicism
Beurla Leathann = Broad Scots
Manx (Gaelg) Baarle [bɛːᵈl] = English (language)
Baarlagh = of or pertaining to the English language
Baarlaghys = Anglicism
Baarleyr = English-speaker, anglophone
Baarle Albinagh = Scots, Lallans
Baarle Ghaelagh, Baarle Vanninagh = Anglo-Manx (language)
Baarle Heenagh = pidgin
Baarle chiart = the Queen’s English

Etymology: from the Old Irish bél (mouth) and -ra (collective suffix) [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

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Caves

Caves, hollows and related words in Celtic languages.

Deeper in the cave

Proto-Celtic *oumā = cave
Old Irish (Goídelc) úam = cave
Irish (Gaeilge) uaimh [uəvʲ] = cave, souterrain, underground chamber, cellar, crypt, vault, den of thieves, pit
uaimheadóireacht = exploration of caves, potholing
uaimheolaí = speleologist
uaimheolaíocht = speleology
uaimheolaí = speleologist
uaimh ifrinn = pit of hell
uaimh ladrann = den of thieves
Scottish Gaelic (Gàidhlig) uamh [ũə̃v] / uaimh = cave, den, hollow, grave, grotto
uamh-thalmhainn = souterrain, underground passage
Manx (Gaelg) oghe = cave, oven
ooig = den, cavern, grotto, antar, pit, stope, hotbed, cave
ooig-oaylleeaght = speleology
Middle Welsh (Kymraec) guocof, guocob, gogof = cave
Welsh (Cymraeg) (g)ogof [ˈɔɡɔv / ˈoːɡɔv] = cave, cavern, grotto, cleft, cavity, den, lair
ogof l(l)adron = den of thieves
Cornish (Kernewek) gogow = cave, cavity

Etymology: from the Proto-Indo-European *h₁ewn- (empty) [source].

Proto-Brythonic *fowyā = den, lair, cave
Middle Welsh (Kymraec) ffeu = den, lair, cave
Welsh (Cymraeg) ffau = den, lair, burrow, set, covert, cave
Cornish (Kernewek) fow = cave

Etymology: from the Latin fovea (pit, hole in the ground, snare) the Proto-Indo-European *bʰow- (pit, hole) [source].

Proto-Celtic *kow-sto- / *kuwo- = hollow, cavity
Old Irish (Goídelc) cúas = hollow, cavity
Middle Irish (Gaoidhealg) cúa = hollow, cavity
Irish (Gaeilge) cuas = cavity, hollow, recess, cove, creek
cuasach = cavernous, hollow, concave
cuasacht = concavity
cuasfhuinneog = bow-window
cuas-súileach = hollow-eyed
Scottish Gaelic (Gàidhlig) cuas [kuəs] = hollow, cavity, cave
cuasan = hole, cavity
Middle Welsh (Kymraec) cev, keu, kau = hollow, closed
Welsh (Cymraeg) cau = hollow, empty, sunken, fig. false, deceitful; enclosing, shut, closed; vacuum, cavity, inwards, bowels
yghau = closed, shut
Cornish (Kernewek) kew = hollow
Old Breton cau = covered
Middle Breton queu = covered
Breton (Brezhoneg) kew = hollow

Etymology from the Proto-Indo-European *ḱowh₁ós (hollow) from *ḱewH- (to swell) or *kewh₂- (vault, hole) [source].

The Breton word kavarn (cave, cavern, den, lair) comes from the same PIE root, probably via the Latin caverna (hollow, cavity, cave, cavern), from cavus (hollow, concave), frp, the Proto-Italic *kawos [source].

Other words in Breton for cave are groc’h, mougev and roc’h toull. There don’t appear to be any cave-related words that are cognate with the other Celtic languages.

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, logainm.ie, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

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Names

Words for name in Celtic languages.

Proto-Celtic *anman = name
Gaulish anuana = name
Primitive Irish ᚐᚅᚋ (anm) = name
Old Irish (Goídelc) ainmm, ainm [anʲmʲ] = name, reputation, repute, renown; noun
Irish (Gaeilge) ainm [ˈanʲəmʲ] = name, reputation, noun
Scottish Gaelic (Gàidhlig) ainm [ɛnɛm] = name, denomination, title
Manx (Gaelg) ennym [ɛnɛm] = name, noun, epithet, designation, title of book, figurehead
Proto-Brythonic *anw [ˈanw] = name
Old Welsh anu = name
Middle Welsh (Kymraec) enw = name
Welsh (Cymraeg) enw [ˈɛnʊ / ˈeːnu] = name, appellation, appellative; title, denomination, term, name or title; noun
Cornish (Kernewek) hanow [‘hanɔʊ / ‘hænɔ] = name, noun, substantive
Middle Breton hanu, anff = name
Breton (Brezhoneg) anv [ˈɑ̃n.o] = name, noun

Etymology: from the Proto-Indo-European *h₁nómn̥ (name) [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, teanglann.ie, On-line Manx Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

Useful phrases

What’s your name?

  • Irish: Cén t-ainm atá ort? Cad is ainm duit? C’ainm atá ort?
  • Scottish Gaelic: Dè an t-ainm a th’ort
  • Manx: Cre’n ennym t’ort?
  • Welsh: Beth ydy dy enw di?
  • Cornish: Pyth yw dha hanow?
  • Breton: Petra eo da anv? Pe anv out?

My name is …

  • Irish: Is mise … / Mise … / … is ainm dom
  • Scottish Gaelic: Is mise …
  • Manx: Ta’n ennym orrym … / Mish …
  • Welsh: … dwi / … ydw i
  • Cornish: Ow hanow yw …
  • Breton: … eo ma anv

More phrases in:
Irish, Scottish Gaelic, Manx, Welsh, Cornish, Breton

Tracks & Paths

Words for tracks & paths in Celtic languages.

Bluebell woods / Coed Clychau'r Gog

Old Irish (Goídelc) casán / cosán = path, footpath
Irish (Gaeilge) cosán [kəˈsˠɑːn̪ˠ / ˈkɔsˠɑːnˠ / ˈkɑsˠɑnˠ] = path, footway, track; way, passage; direction
Scottish Gaelic (Gàidhlig) casan [kasan] = path, supporting beam, treadle, wattle
Manx (Gaelg) cassan = path, trajectory, passage, sidewalk, thoroughfare

Etymology: from the Old Irish cos (foot) & -án [source].

Proto-Celtic *slixtus = track, section
Old Irish (Goídelc) slicht [sʲl͈ʲixt] = path, trace, track, trail, section, offspring
Irish (Gaeilge) sliocht = mark, trace, track; offspring, line, progeny, posterity; passage, tract, extract
Scottish Gaelic (Gàidhlig) sliochd [ʃlixg] = descendants, offspring, increase, progeny, succession, lineage
Manx (Gaelg) sliught = line, issue, spawn
Welsh (Cymraeg) llywbr = path, footpath, beaten track, unmade pathway; footprints, tracks, trail; course, direction, orbit; method, manner, mode
Old Irish (Goídelc) slighe [sʲl͈ʲixt] = path, trace, track, trail, section, offspring
Irish (Gaeilge) slí = way, road, track; route, passage; course, direction; distrance, journey; means, method
Scottish Gaelic (Gàidhlig) slighe [ʃLʲi.ə] = path, track, trail, way; course, passage, route
Manx (Gaelg) sleayd (?) = trail, dredge, sledge, toboggan, trailer
Proto-Celtic *sentus = path, way
Old Irish (Goídelc) sét [sʲl͈ʲixt] = path, trace, track, trail, section, offspring
Irish (Gaeilge) séad = path, way; course, journey
Scottish Gaelic (Gàidhlig) séad = way, road
Proto-Brythonic *hɨnt [hɨnt] = path, way
Middle Welsh (Kymraec) hint, hynt = way, path, course
Welsh (Cymraeg) hynt [hɨ̞nt / hɪnt] = way, path, course, journey, march; career, expedition, campaign, venture; affair; fate, condition, state; mood, freak, whim
Middle Cornish hyns [hɪns] = course, path, road, way
Cornish (Kernewek) hens [hɛnz] = course, path, road, way
Old Breton hint = path, road
Middle Breton hent = path, road
Breton (Brezhoneg) hent [hɛ̃nd] = path, road

Etymology: from the Proto-Indo-European *sent- (to head for, go, travel) [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic