Well, the existence of those movies is an "excuse for
Xavier with that pronunciation". That's how Professor X pronounces his surname. I had never heard the name before seeing the first X-Men movie and only found out that the "correct" pronunciation is zay-vee-r when I started posting here.
You should look at the
Xavier page on BTN also. ig-ZAY-vee-ər is listed.
Persephone Evander Hero
Fae Nocturne Silver
www.behindthename.com/pnl/59411