From the gaming report
Eden Studios, the publishers of the Official Buffy and Angel Roleplaying Games have been working on a new book about the Watcher's Council. It was decided, that the Watchers would have files on the existing/past slayers, and Eden thought it looked odd that Faith and Kendra don't have surnames.
So they asked FOX... who asked Joss Whedon...
ded their official names, names that will appear in any licensed products (novels or even TV shows) after the Watcher's Book comes out. And Eden will publish them first.
The only thing is, I can't tell you what they are... signed confidentiality agreements and everything... To paraphrase another movie, no-one can be told what their names are, you'll have to see for yourself.