Who says he's not? Speaking as an Australian, we're not all called Bruce and Sheila, and we've got people from all over the world here that are more than capable of giving their offspring bad names.

For that matter, who says it's a real name? Ironic-yet-self-depreciating nicknames are as Australian as you can get. In Australia, Diablo would be the meek little guy in the back of a bar, the one sipping on milk or water or something.