Phew! I'm glad when I read it it said "mn"! Because I strongly dislike it, the spelling and the sound. It helps that's it's honoring, that's a plus! I think it's definitely a masculine name, without a doubt. I would cringe even more if I saw it on a girl.
For fn's, how about:
Leo Bracken
Theodore /
Theo Bracken
Nathaniel Bracken
Walter Bracken
Jude Bracken
Rudolph /
Rudy Bracken
James Bracken
Edward Bracken
Harry Bracken
Henry Bracken
Philip Bracken
Peter Bracken
like any?