Actually, the law is somewhat about who is right. If he has a trademark for name that covers your space and you use the exact same name, then (IANAL) it sounds

Actually, the law is somewhat about who is right. If he has a trademark for name that covers your space and you use the exact same name, then (IANAL) it sounds like he's correct. But you should spend some time and money to consult a lawyer. My guess is they would tell you that you don't have a case.