Which names sound better?

I am having a hard time figuring out names. For girls I like Brooklyn, Addyson, RayLee, GraceLynn, Grace, and Harper but I dont know about middle names. For boys I like Nathan Holden, Kade, Issac, Bently, and Wyatt but also dont know any middle names. Can you help what sounds good with what and throw in some names you like to it might give me some more ideas to work with.