The Celtic language is a group of languages that originated in the Iron Age and are still spoken today. The crossword solutions for the term Celtic Language include BRETON (6 letters), IRISH (5 letters), CORNISH (7 letters), GAELIC (6 letters), ERSE (4 letters), WELSH (5 letters), MANX (4 letters), and OldIrish (8 letters). These languages are all related to each other, and are spoken in various parts of Europe, including Ireland, Scotland, Wales, Cornwall, and the Isle of Man.