I'm not a big fan. I can understand why if it's the mother's maiden name, but I don't really like the sound of it. I have a friend with a surname as a first name and a first name style surname... he doesn't like the mix-up. His name is Davis too. I also know a guy (with a normal name) who had a girl's name for his last name... now that switch-around (so he had a girl's name and his name as a last name) was amusing.

Harper I tend to associate with Harper Lee, who was a girl.