I
Ella Ruth and
Ella Nicole are nice. I would stay away from
Ella Grace myself, as it's a very common name.
I can't log in for some reason, so I can't access my PNL to help me think of more combos. So here are a few:
Ella CarolineElla CatherineElla JaneElla MadelineElla MaeveElla MargaretElla SuzanneElla Therese