Christian name
baptismal name

I have told you never to use my Christian name, she said.

It was the first time she had used his Christian name.

They started to call one another by their Christian names.

They'd learned only a couple of those, and then just Christian names.

Many, if not most of them he had always called by their Christian names.

"How long have you called your parents by their Christian names?"

As the major with the strange Christian name had said, that was life.

But the reader is not told his Christian name or indeed anything else about him.

And this was the first time they had ever used Christian names, because one didn't do it at school.