because black rihnos are black and god chose that name why did you ask that silly quistion? A popular theory of the origins of the name "White Rhinoceros" is a mistranslation from Dutch to English....
They aren'r really, it's all down to a messed-up translation. In Africa there are two species of rhino, one with a wide mouth and one with a pointy mouth. Wide in afrikaans is something like "weit",...