1. pass-CAL (like in calorie) or pass-CALL (like in cauliflower)?
I pronounce it pas-CALL or pas-CALE to not confuse it with Pascal.
2. Appropriate for a Jewish girl?
I guess so.
3. WDYTO nicknames
Pax and
Callie?
I don't like any nn for this one. Just straight.
4.
This I'd answer, but I'm kind of lazy and don't have the time for right now.