Not agreeing in baby names.

LeeAnn
So me and my sweety cannot agree on a girl name we don't know what we are having yet. But he likes Elle Grace and I think when she would get older it would still sound like a baby name. And I'm about to have a niece 4 months  Before I have my baby and her middle name will be Grace. What is more grown name for Elle I kinds like Elissa but he doesn't.