> I have no data but feel that boys tend to get the family names and biblical names (in US anyways).
Or both: the family names having been chosen originally from biblical names, but not continuing for that reason.
I'm a David, and there were many Davids in my University intake year, but I suspect that has less to do with the Bible and more to do with mothers of a certain age range having interests in the Davids Bowie or Essex (or both! - quite possible in my mother's case).