Thanks so much for the input everyone!
It seems like Elsa and Anna are the standouts. I agree about Ella being very popular, that is my biggest hesitation with it.
For the poster that asked, Lea would be pronounced Leah but I could see how that could be confusing!
And for the poster that thought they were all very blah, we have a complicated last name that is always mispronounced, so we like the idea of a simple, pretty girls name.
Thanks again. Hope everyone finds the perfect baby names!