For girls I currently have Marnie, Merryn, Marion, Marin (sense a theme?!).
For boys I have nothing, absolutely nothing. I'm not keen on any of the natural matches (Milo, Oscar, Felix, Arlo) etc. DH chose DS's name and while it's grown on me I would like something a little more quirky but still matching if DS2 turns out to be a boy.
We have a super duper long surname so first name needs to be two syllables, three if the name is fabulous!