I think it's an adorable name and I don't think it's popular at all. Well, it's not at all where I live [Hawaii]-- might be quite different where you're from, however.
I don't think it is popular outside of Jennie Garth naming her daughter that a few years ago.
Also, I noticed your other child's name in your siggy and think Luca Bella would be way too similar.
starsmaycollide:It's not popular, but it's a boy name.
This. Just because it ends in "a" doesn't mean it's a girl's name.
Luca is more commonly a boys name, however it is a Hungarian female form of Lucius.
It's extremely masculine to me. It's not very popular at all.