If my twelve year old son were a girl, he would have been named
Daphne. It doesn't seem too popular anywhere, actually, but I suppose more so on this board than most others.
Elsa is also one of my favorites and I have seen a surge of interest in it on this board and others. I've heard several comments that it sounds like a cow's name, so I don't think it will ever rise too far up the popularity charts.