From your first list of names, I like...
Benjamin
A suggestion for Brennan, I too feel it sounds masculine, how about dropping the last N? Brenna
From your second list, I like...
Connor, Ethan, and Mason - we also have Ethan on our "list"
We also like Matthew for it's meaning.
Molly - also on our list, great meaning too!
For girls, I LOVE the name Jenna, but my husband doesn't, I keep sneaking it on the list and he just laughs! Right now we aren't set on any, I may suggest once we're matched with a birthmom, that we'll show her our favorites and ask for her thoughts ( if she is comfortable with that ), in the mean time, I keep working on Jenna, LOL!
Good luck and best wishes!
Hugs,
Deb