Celts must have covered quite a lot of different locations.

Yes, they got around. There are Galicias in NE Spain and in Anatolia; Iberia in Europe and Caucasus. Not sure they were the same ethnicity, nor even if they spoke a Celtic language. There is a field of anthropology called Celtomania, and its opposite, Celtoscepticism. Yes, I noticed the aver le lune, literally, 'to have the moons'.

Ceci n'est pas un seing.