I have a slightly unusual first name (Brant), so far from being given a hard time about it I've endured a life where absolutely no one ever remembers it or hears it correctly. Even my girlfriend's mother was calling me Brent after knowing me for 6 years. My co-workers sometimes call me Bryant after working with me for half a decade. I've had Frank, Brad, Brett, Grant, Barry, Ryan, and even "Burn" offered up to me by clients. But most of of them just call me Brian. "Thanks Brian!" they'll write, right above my email signature, which clearly says Brant.
It used to bug me, a long time ago. Now I just greet it with a certain weary indifference.