Baby Name Trouble!?

I am due to have twins in about a month. They are a girl and a boy. I like these boy names: Jeremy, Alec, Xavier, and Daniel. For him, I definatly want the middle name to be Orion. For the girl I like these names: Elena, Rebecca, and Kara. I dont know about a middle name for her. I need help on the names, and a middle name for my baby girl. If you have any more suggestions, please tell.