They're just names of people at the community! Mine's Yuri. Yuri Nakamura. Though some people call my Yurippe so you can call me that too. Japanese formalities are kind of useless after you're dead.

[ Yuri pauses for a second. She didn't catch his name, but Haruhi did tell her not to recruit certain people from the SOS Brigade. ] Mikuru's a girl's name and she said Koizumi had been here before. Yuki could be either and Kyon doesn't even sound like a real name, so that'd mean you're either Yuki or Kyon, right?