I love, love, love
Sophia. I've adored it since fifth grade and would use it in a heartbeat. I don't think it's too popular (but then, popularity doesn't really bother me), but nobody can answer that question for you. There's no marker that automatically makes a name "too popular". Some people won't use a name if it's in the top 500. Others have no qualms about using the #1 name.
I don't think I'd view it as dated, but I don't think people thought that
Susan and
Jennifer would be viewed as dated either, so you never know.