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The name was rejected by the game as "inappropriate".
There was one game (possibly not Nintendo - but it was an old box) that allowed kids to enter commands at certain points in the game.
Nintendo created species of Pokemon whose names violate their own rules. My daughter did eventually try to name a chicken "Grape" and it was accepted.
Because "rape" is a word where if it was put with anything, it would not be considered offensive. However, "rapist" or "raper" would also be considered offensive even if the said words were put with other characters. I don't even think she's playing this game anymore.
Or, for that matter, the game TELLING YOU why the word was not allowed.
"In game character with that name" sounds totally plausible to me.