Some people refer to their first names as their Christian names.
Despite my attempts to get him to call me by my Christian name he insisted on addressingme as 'Mr Kennedy'.
Christian name in British English
or baptismal name (bæpˈtɪzməl neɪm)
noun
a personal name formally given to Christians at christening
▶ USAGE Christian name was often loosely used to mean any person's first name as distinct from his or hersurname. Nowadays, especially in official documents, alternatives which do not referto a particular faith, and are therefore more inclusive, are used: first name, forename, and given name
Christian name in American English
the baptismal name or given name, as distinguished from the surname or family name
Examples of 'Christian name' in a sentence
Christian name
"Unlike his predecessor, he preferred to call his secretary by his Christian name.
Colleen McCullough THE THORN BIRDS (1977)
In other languages
Christian name
British English: Christian name /ˈkrɪstʃən neɪm/ NOUN
A person's Christian name is the name given to them when they were born or christened.