To everyone who says "its a family name." No its not, not for the last 75 years. When's the last time you ran into someone with that as a surname?
Here in the Balkans, a music star is called Adolf. The irony is that he was born in 1949, only a few years after World War II. I don't know how common the name is in the world, but everyone's first association is Adolf Hitler.
We probably wouldn't have known that someone was using such a name if he hadn't become a popular musician.
To be on topic, I am certainly in favour of banning offensive and confusing usernames and making them impossible for registration and further use. It doesn't have to be exclusively offensive but does anyone remember
~DefaultTrust, obviously only with the idea of trolling and creating confusion? I am surprised that the account is still active.