Words for red in Celtic languages.

Proto-Celtic *dergos = red, crimson
Old Irish (Goídelc) derg [dʲerɡ] = red
Irish (Gaeilge) dearg [ˈdʲaɾˠəɡ / ˈdʲæɾˠəɡ] = red, rouge, red ink, glowing, raw, bloody
Scottish Gaelic (Gàidhlig) dearg [dʲɛrɛg] = red, ruddy, flamming, red-hot
Manx (Gaelg) jiarg = red, sanguine, ruddy, bloodshot, rouge, gules, glowing, stark, florid, live, burning, abandoned, fair (intensive), turned (land)

Etymology from Proto-Indo-European *dʰerg- (to dim, darken) [source]. The English word dark comes from the same root [source].

Proto-Celtic *roudos = red
Gaulish *roudos = red
Old Irish (Goídelc) rúad [r͈uːa̯ð] = red, reddish
Irish (Gaeilge) rua [ɾˠuə] = red, reddish-browm, russet, copper-brown; wild, fierce; rough, strong
Scottish Gaelic (Gàidhlig) ruadh [r̪ˠuəɣ] = (browny) red, rust-coloured, ginger, russet; red colour, redness; strength; red deer
Manx (Gaelg) ruy [rɛi/riː] = red, ginger, tan, copper-complexioned, red-haired, foxy, sandy
Proto-Brythonic *rʉð = red
Welsh (Cymraeg) rhudd [r̥ɨːð / r̥iːð] = red, ruddy, purplish, bay, tawny, brown; bloody, covered with blood; scorched
Cornish (Kernewek) rudh [ry:ð / ri:ð] = red
Breton (Brezhoneg) ruz = red

Etymology: from Proto-Indo-European *h₁rewdʰ- (red) [source]

Proto-Celtic *kokko-/*kokki = red
Proto-Brythonic *kox = red
Middle Welsh (Kymraec) coch = red
Welsh (Cymraeg) coch [koːχ] = red, redness, ruddy, scarlet, bloody; ginger (hair); brown; poor, feeble, unskilful
Cornish (Kernewek) coch / cough = red

Etymology: from the Latin coccum (a scarlet berry), from the Ancient Greek κόκκος (kókkos – berry). This is also the root of coccinus (scarlet, scarlet-dyed), from which comes the English word cochineal, and related words in other languages [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary,, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

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