Quaoar? Sedna? We already knew about Pluto, once regarded as the ninth planet in our Solar System. But Pluto was demoted from planet to "object" not long ago, and placed in the club of other Kuiper Belt Objects.
It's not easy to remember that Quaoar and Sedna are Kuiper Belt cousins to such objects as 2003 EL61, an ovoid planetoid with a name like a vacuum tube, let alone pronounce their names. I'm struggling with Quaoar and am sure that I sprained my tongue. I imagine Quaoar might be more popular in some country such as Saudi Arabia, since they are already near Qatar, which is also unpronounceable in Massachusetts.
Kuiper, I think, is supposed to sound like "wiper" with a K, but maybe not.
Say it like this: Qwaaaaooooorrrrrrrr ! Sedna is easy, but weird. Xena, of course, is the Warrior Princess.