Not surprised your parents are a bit pissed seeing as your name is one of the very few real gifts they (or anyone) ever really get to give you. Cassius could be cool in someways... but for some bigoted, crap, and vaguely humurous reason the first image it conjured up in my head was of a guy in feathered hat moving up and deciding that Cassius was now the big pimp on the bloc.

Think carefully about it, if it's something you really want... then you probably shouldn't need anyone else to tell you it sounds good. Either way good luck.