All the Kristies and Tinas I knew were named
Kristi or
Tina except one
Tina who I think was
Bettina, and one
Kristy who was
Kristen. Oh, and there was a local politician here in Delaware for many many years who was actually named
Evelyn but had always been called
Tina. She was nearly ninety when she died a few years ago.
I don't think
Christina is dated. It has been fairly popular for a long time. And I don't think that a nonChristian using the name
Christina is any more unusual than say, a nonJew using the name
Judith.
Christian, yes, it would be a bit odd for a nonChristian to give that as a name, but even then, it's popular right now so that would take away most of the oddness.
I think I like
Kristina just a shade better right now but they're both fine. Our top choices for our daughter were
Valerie and
Ashley, and
Christina was a close third.
Christina over
Christine any time.
Crystal is cute too but it has a more downmarket image than
Christina.