Words for old woman, crone, hag in Celtic languages.

Old Irish (Goídelc)	caillech = nun, housekeeper, elderly woman, crone, hag
Irish (Gaeilge)	cailleach = nun, old woman; hag; precocious girl; spineless fellow, coward; spent, shrivelled, thing; stump; truss, bundle (of straw)
Scottish Gaelic (Gàidhlig)	cailleach [kaʎəx] = old lady, old woman; old biddy, hag; her indoors, the wife, the old lady; landlady
Manx (Gaelg)	caillagh = witch, crone, old woman, single woman; glaucous gull

Etymology: from the Old Irish caille (veil), from the Latin pallium (cloak, coverlet) [source].

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

Proto-Celtic	*wrakkā = woman
Old Irish (Goídelc)	frac = woman
Welsh (Cymraeg)	gwrach = ugly old woman, crone, hag, witch, sorceress
Old Cornish	gruah = old woman
Cornish (Kernewek)	gwragh [gwra:x / gwræ:h] = hag, witch, wrasse (fish), woodlouse
Breton (Brezhoneg)	gwrac’h = old woman, witch, fairy, mermaid

Words marked with a * are reconstructions.

Sources: Wiktionary, Proto-Celtic English Word List, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau