Christian name
Concise Oxford English Dictionary © 2008 Oxford University Press:
Christian name
▶noun a forename, especially one given at baptism.
usage: In recognition of the fact that English-speaking societies have many religions and cultures, not just Christian ones, the term Christian name has largely given way, at least in official contexts, to alternative terms such as given name, first name, or forename.
'Christian name' also found in these Oxford entries:

