Pluto was the name of the cat in Edgar Allan Poe's story, The Black Cat. It was horribly mistreated by it's owner, but in the end revenged itself upon its master.
― Anonymous User 2/4/2007
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Pluto is part of the Kuiper Belt now, which is full of objects the size and bigger of Pluto. Charon was the name of a satellite (moon in laymen's terms), but they recently discovered there was another satellite and they called it Charon II.
Sources: https://en.m.wikipedia.org/wiki/Pluto_(disambiguation)
https://en.m.wikipedia.org/wiki/Plouto_(mother_of_Tantalus)
https://en.m.wikipedia.org/wiki/Plouto_(Oceanid)