Also Romansh: Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars https://sursassiala.ch/2015/01/15/familienforschung/
Commonly pronounced KSAH-vər in German today, although the older and more traditional pronunciation of KSAH-fər is still heard in the southern regions of Germany, as well as in Austria.
https://cs.m.wikipedia.org/wiki/Xaver