Ah, they have a sense of humour.
Look up the background behind the names "Eris" and its moon "Dysnomia". Who were they, and what were they known for? That in itself is entertaining, given the debate that 2003 UB313's discovery triggered.
...and only after you've done that - remember back to its nickname, Xena. Who was the actress who played that role in the TV series?
You'll see the connection
. Nice one.