Twin girls

So my boyfriend and I have having twins yay. And we've decided we get to name ones frist name and ones middle name to make things fair.

He's already chosen baby number 1 frist name and I've chosen her middle name(not final just testing it out) But I can't think of any names that I like to go with it, cause I don't want their frist names to be all similar or start with the same letter cause we are doing that with middle names.

Any suggestions?

Baby number 1 name is Bethany Mae.M