#93 - Stupid Kong

The reason why Donkey Kong isn't called Monkey Kong is because Shigeru Miyamoto kept mistaking the word "donkey" with the word "ass", and thought that Americans would believe "Donkey Kong" meant "stupid ape". The idea, which started as a joke, became real.

SOURCE: http://web.archive.org/web/20080512170117/http://www.quartertothree.com/features/e3_2001/miyamoto.shtml