What's my name? Metta World Peace and self-determinism

I've got the Lakers/Thunder game on and there's a stream of tweets ridiculing Metta World Peace (born Ron Artest) for his change of name. I find it all the more remarkable as I reflect in the context of Black History Month.

It was 1967. Cassius Clay had changed his name to Muhammad Ali. Leading up to one of his earliest fights after the name change, opponent Ernie Terrel continued to refer to him as "Clay," publicly disrespecting Ali's decision to change his name.

Ali spent 15 rounds beating Terrel up while yelling at him, "What's my name?!"