I like
Elsa. It is short and classy. I have known only one, who would be about 40 or 45 now. She was from Mexico, so I don't think of
Elsa as having a Germanic feel, as New_Chloe mentioned.
I would think
Elsa would have some potential to grow in popularity, because it is similar to
Ella and
Emma, and of course these are very popular. But then I have thought
Ellen would climb for the same reason, and it doesn't seem to be going anywhere fast.