They won’t let Pluto be a planet but it still bears the responsibility of having moons, and until just now there were three known moons of the tiny non-planet, named Hydra, Charon and Nix.
Now there are four, and the fourth one is called Essslashtwoohoneonepeeone.
They are working on another name. Bad Astronomer has details about the new find.
There is some difficulty in coming up with a name since the theme of the existing names (night-based Roman mythical character) is tapped out. I was thinking it should be called one of the following:
Or, to be more accurate in terms of size and such, maybe just “Pluto’s Kid Brother” or “k.b” for short.