Now I’m completely lost. Are you saying everyone is Irish? ;-)
Just kidding. On the question of ancestry, the furthest I take it back is to the country from where the person’s ancesters emigrated to the U.S. That’s why I consider Galli an Italian name.
You’ve definitely traced it back much further than I did. :-)
The Galician version is written in ancient Greek. The Oxford version is written in English ~ rather modern too.
Most everything you heard about the "illiterate Celts" back in pre-Roman times appears to have been BS. They spoke Celtic languages, but their Greek slaves wrote in Greek.