Words for left, north and related words in Celtic languages.

| Proto-Celtic |
*kliyos = left (hand)
*uɸokliyom = north |
| Old Irish (Goídelc) |
clé = left
fochlae = the north, seat of honor |
| Middle Irish (Gaoidhealg) |
clé = left
fochla = the north, seat of honour |
| Irish (Gaeilge) |
clé [clʲeː / clʲiː] = left, left hand, left-hand side
clébhord = port, larbord |
| Scottish Gaelic (Gàidhlig) |
clì [kliə] = left |
| Manx (Gaelg) |
clee = left |
| Proto-Brythonic |
*kleð = left, northern
*gwogleð [ɡwoˈɡlɛːð] = north |
| Old Welsh |
cled = left hand, left side
gogled = north |
| Middle Welsh (Kymraec) |
cled, kled = left hand, left side
argled = left, unlucky, unfortunate
gogled = north |
| Welsh (Cymraeg) |
cledd [kleːð] = left, left hand/side
argledd = left, unlucky, unfortunate
gogledd = north, northern, northerly |
| Cornish (Kernewek) |
kledh [klɛ:ð / kle:ð] = left, left-handed, northern
kledhbarth = north
gogledh = north
a-gledh = on the left
a-gledh dhe = to the left of
a-gledhbarth = on the north side |
| Breton (Brezhoneg) |
kleiz = left, left-handed; short-tempered, irascible; north |
Etymology: from the Proto-Indo-European *ḱléyteh₂ (leaning, sloped, inclined) from *ḱley- (to lean, incline) [source].
| Proto-Celtic |
*(s)kīttos = left, left-handed, clumsy, awkward, wrong, sinister, sad |
| Middle Irish (Gaoidhealg) |
cittach = left-handed, awkward |
| Irish (Gaeilge) |
ciotach [ˈcɪt̪ˠəx / ˈcɪt̪ˠa(h)] = left-handed, awkward, clumsy, difficult, troublesome, inconvenient
ciotachán = left-handed person, awkward, clumsy person
ciotóg = left hand, left fist, lefthanded person
ciotógach = left-handed, left-fisted, awkward |
| Scottish Gaelic (Gàidhlig) |
ciotach [kʲihdəx] = left-handed, awkward, sinister
ciotachan = left-handed person |
| Manx (Gaelg) |
kiuttag = left hand
kyttagh = left-handed
kiuttaght = left-handedness |
| Middle Welsh (Kymraec) |
chwith, hwidd = left, left-handed |
| Welsh (Cymraeg) |
chwith [χwiːθ] = left; left-handed, awkward, bungling, uncouth, unfortunate, sinister, sad, strange, unaccustomed, unusual, wrong, amiss; the left (hand); the Left
chwithig = left, left-handed; strange, awkward, clumsy, bungling, wrong, inauspicious, unpleasant, suspicious
chwithlyd = sinister, chilly
gochwith, go chwith = contrary, opposite, inside out, clumsy, awkward, left-handed; evil, mishap, misfortune |
Etymology: from the Proto-Indo-European *skh₂ey- (left) [source].
| Proto-Celtic |
*towto = left, north |
| Old Irish (Goídelc) |
túaid, thúaid = north, in the north
túaidemain = in the north, northwards
fa thuaith, fo thuaidh = northwards, to the north |
| Irish (Gaeilge) |
thuaidh [huəɟ / huə / huəj] = (in the) north, northern
ó thuaidh = to the north, northwards
aduaidh = from the north |
| Scottish Gaelic (Gàidhlig) |
tuath [tuə] = north
tuathach [tuəhəx] = northerner, person from North Uist; northerly, northern, boreal |
| Manx (Gaelg) |
twoaie = north, northerly, northern, boreal, northward
twoaieagh = northerner, northsider, northern (Manx) person
goal twoaie = rainbow (“going north”) |
| Old Breton |
tut = good, favorable
tuthe = a kind of demon |
Etymology: possibly from the Proto-Indo-European *tewto- or *tewH- (to look favorably, protect, observe). Cognate with the Latin tūtus (safe, prudent, secure, protected), which is the root of English words like tutor and intuition [source].
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