Rule to remember: all Gauls (Gaulois) were Celts, but not all Celts were Gauls
and not all Gauls (Gaulois) ... were Gauls
See:
https://en.wikipedia.org/wiki/Galicia_(Spain)
https://en.wikipedia.org/wiki/Galicia_(Eastern_Europe)
Awe Kaiser
Languages are a hodge-podge.
This is actually closer to the original Latin pronunciation than the modern English pronunciation of "Ave Caesar".
"Ah-way", IIRC, and yep the C was a hard C.