The term `Gaelic' refers to the Celtic languages of the Goidelic (q-Celtic) subfamily. Contrary to popular belief, Welsh, Cornish, and Breton are not Gaelic, but rather belong to the Brythonic (p-Celtic) subfamily. All these languages (Goidelic and Brythonic) are insular Celtic, as opposed to Continental Gaelic, which has as its primary example the long-extinct Gaulish. Although spoken primarily in Brittany in France, Breton is believed to have originated on the Isles, and is hence not considered `continental'.

Some Gaelic languages: