I understand that
XAVIER and
Javier are interchangeable and pronounced the same way in Spanish. Obviously there aren't any Spanish vocabulary words starting in an X nowadays (only loan words from Greek). Was there a similar interchangeability between X and J in former days in Spanish? Or isn't X a Spanish letter at all? All the books say, the name Xavier/Javier goes back to a Basque word (or two rather), so maybe all this appears in Basque only?
Bring light into my darkness!
Andy ;—)