Sonja MacRoth said

I was wondering, would it be possible to create a fictionnal map of Celtia where we would see where the family names are. It would be nice to see where the MacRoth's families are in Celtia geographicaly!

Why would it need to be a fictional map, Sonja? The Celts are a real historical people, not fiction. Its well known where the different tribes, clans etc were located. For example the Helvetii were in the western parts of modern Switzerland. We know where their cities were.

The idea of a map is a good one, though. But it should be historical, not fantasy.