I've said before that Simon is my favorite. Did you consider Holden or suggest that one? I like Marshall, Leo, and Colin a lot too.
I'm just going to throw out a lot of the names on my long list...sorry for any repeats:
Abram, Alec, Arthur, Brendan, Calvin, Cedric, Desmond, Everett, Felix, Graham, Grant, Hugh, Ian, Lawrence, Lewis/Louis, Linus, Max/well, Neil, Scott, Soren