Have you ever met or known someone who has the same name as you (first and last) but is not a relative?
There's a few guys out there with my name. I traded email with one who found me through Google. He was a Celtic pagan / historical re-enactor / aerospace engineer with kids. Fortunately we were on opposite sides of the planet or there'd be no telling us apart.
He said all his friends had declared that he was the evil twin. I wasn't going to argue.