Hi,
To agree with some upthread posters, it's more than likely that you have a similar name to someone who is wanted on an outstanding warrant. It happens to me, as I have a good old fashioned WASP name. Once was the full bore secondary through immigration, where they explained to me it's because of the name, now it's just secondary through customs, which takes a little more time. I have some misdemeanors in my past, and am probably going to go through the DHS dispute process soon.
Cheers.