Unfortunately, we may never know the answer, since everyone quotes Word-of-God to support their side of the argument pre-The Last Roundup...and then the definitive end-all answer was removed. So now the debate rages again.
Eh, guys who do the show, said Derpy is fine, it's just an itunes edit. she was still derped and had a muffin bag in the newest episode, so she's still Derpy.
However, as far as I can tell the actual name was retconned because it insulted someone. At least, that was how I took the Hasbro response to the mass "WTF".
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