Today we’re looking at the words for moon, Monday and related things in Celtic languages.
Words marked with a * are reconstructions.
Proto-Celtic |
*louxsnos = (?) |
Old Irish (Goídelc) |
lúan = moon, Monday, radiance |
Middle Irish (Gaoidhealg) |
lúan [ˈl͈uːə̯nʲ] = moon, Monday, doomsday, judgement day
día lúain [dʲiːə̯ ˈl͈uːə̯nʲ] = (on) Monday |
Irish (Gaeilge) |
Luan [l̪ˠuən̪ˠ] = Monday, Aureole, nimbus, halo
Dé Luain [dʲeːˈl̪ˠuənʲ] = (on) Monday |
Scottish Gaelic (Gàidhlig) |
Luan [l̪ˠuən] = Monday, the moon (poetic)
Diluain [dʲɪˈl̪ˠuən̪ʲ] = Monday |
Manx (Gaelg) |
luan, lune = moon
Jelune, Jyluain, Lhein, Luain = Monday |
Middle Welsh (Kymraec) |
llun = Monday, (the) moon |
Welsh (Cymraeg) |
llun, Llun [ɬɨːn /ɬiːn] = Monday, (the) moon
dydd Llun [dɨːð ˈɬɨːn / diːð ˈɬiːn] = Monday |
Middle Cornish |
lin = the moon
di-lin, De Lun = Monday |
Cornish (Kernewek) |
Lun = Monday
dy’Lun, de Lun = Monday |
Breton (Brezhoneg) |
Lun = the moon
dilun [di.ˈlỹːn] = Monday |
Etymology from PIE *lówksneh₂ (moon, shining thing), from *lewk- (to shine, to see, bright) [source].
Words from the same PIE roots include illumiate, light, lucent, lucid, Lucifer, luminous, lunar, lustre, and lynx in English [source].
Etymology (Monday words) from Latin *diēs Lūnae (Monday), from diēs (day) and Lūna (the moon, Luna [a moon goddess]), or calques of this word [source].
Words from the same roots include dilluns (Monday) in Catalan, dilunes (Monday) in Occitan, and dilon (Monday) in Walloon [source].
Proto-Celtic |
*lugrā = moon |
Proto-Brythonic |
*lloɨr = moon
*lloɨrkann = moonlight |
Old Welsh (Kembraec) |
loyr = moon
loiraul = lunar |
Middle Welsh (Kymraec) |
lloer = moon
lloerferch = one as fair as the moon, fair maiden, beautiful woman
lloergan = (bright) moonlight, moonlit
lloeric = lunatic, moonstruck, insane, mad, frantic, wild, lunar
lloerol = lunar |
Welsh (Cymraeg) |
lloer [ˈɬoːɨ̯r /ˈɬɔi̯r] = (the) moon, satellite
lloeraidd = lunar, lunatic
lloeren = circle, round spot, satellite, little moon
lloerennol = satellite, pertaining to the moon
lloergan = (bright) moonlight, moonlit
lloergannu = to shine (of the moon)
lloeri = to crook like the new moon, make cresent-shaped
lloerig = lunatic, moonstruck, insane, mad, frantic, wild, lunar |
Old Cornish |
luir = moon |
Middle Cornish |
loer, lor, lôr, loor, lour, lûr = moon |
Cornish (Kernewek) |
loor = moon
lorel = lunar
lorell = satellite
lorek, loroges = lunatic, maniac, psychotic |
Old Breton (Brethonoc) |
loir, loer = moon |
Middle Breton (Brezonec) |
loar = moon
loer cann = full moon |
Breton (Brezhoneg) |
loar = moon
loargann = full moon
loarieg = lunatic |
Etymology from PIE *lewk- (bright, light, to shine, to see), or from *lewg- (to bend, twist) [source].
Middle Welsh (Kymraec) |
lleuad, lleuat = moon
lleuadic = mad, lunatic |
Welsh (Cymraeg) |
lleuad [ˈɬeɨ̯.ad /ˈɬei̯.ad] = the moon
lleuadu = to crook like the new moon, make cresent-shaped
lleuadaidd = lunar
lleuadig = mad, lunatic
lleuadog = lunar, moon-like, moonlit, lunatic, moonstruck, mad, insane |
Etymology from PIE *lewk- (bright, light, to shine, to see). Related to lleu (light, brightness) and golau (light, bright, fair) in Welsh [source].
Proto-Celtic |
*ēskyom = moon |
Old Irish (Goídelc) |
éscae, aesca, æscae, ésca, æscæ, éisce [ˈeːske] = moon, lunar month
éscaide = lunar |
Middle Irish (Gaoidhealg) |
éscae = moon
éscaide = lunar |
Irish (Gaeilge) |
éasca [ˈiːɑ̯skə / ˈeːsˠkə] = moon
éascaí = lunar |
Scottish Gaelic (Gàidhlig) |
èsga [eːsgə] = moon (archaic) |
Manx (Gaelg) |
eayst = moon, lunar
lane-eayst = full moon |
Etymology from PIE *h₁eysk- (to shine, glitter) [source].
Middle Irish (Gaoidhealg) |
gelach = moon |
Irish (Gaeilge) |
gealach [ɟəˈl̪ˠɑx / ˈɟalˠəx] = moon, brightness (as of moon), moonlight |
Scottish Gaelic (Gàidhlig) |
gealach [gʲal̪ˠəx] = (the) moon
gealach làn = full moon
gealachail [gʲal̪ˠəxal] = lunar
gealachan [gʲa̪ˠəxan] = lunatic |
Manx (Gaelg) |
giallagh = moon |
Etymology from Old Irish gel (fair, white, bright), from Proto-Celtic *gelos (shining, white), from PIE *ǵʰelh₃os, from *ǵʰelh₃- (to shine) [source].
Words from the same roots include words for white, bay and brown in Celtic languages, and arsenic, gall, gild, gild, gold and yellow in English [source].
Old Irish (Goídelc) |
ré = moon |
Middle Irish (Gaoidhealg) |
ré, re = the moon |
Irish (Gaeilge) |
ré = moon, phase of the moon, month, period, portion of time, span of life, career, age, era, epoch
na ré = lunar
(oíche) rédhorcha = moonless |
Scottish Gaelic (Gàidhlig) |
rè [r̪eː] = the moon (poetic) |
Manx (Gaelg) |
re, ray = moon |
Etymology possibly from Proto-Celtic *rowis [source].
Another word for moon in Welsh is cannwyll awyr (“sky candle”), and the word cannaid (white, bright, shining, pure, clean radiant) used to mean moon in Carmarthenshire (and sun in north Wales).
Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, An Etymological Dictionary of the Gaelic Language, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic