 "Gaelic", by itself, is sometimes used to refer to Scottish Gaelic, especially in Scotland, and so it is ambiguous.The endonyms (', ' and ' in Irish, ' in Manx and ' in Scottish Gaelic) are derived from Old Irish "Goídelc", which in turn is derived from Old Welsh ' meaning "pirate, raider".The medieval mythology of the "" places its origin in an eponymous ancestor of the Gaels and the inventor of the language, .