Wikipedia claims their real nams are:True. I guess they could do like the 2011-Thundercats series and give new names to, say, Beast-Man, Mer-Man, Moss-Man, Fisto, etc..., like TC did with Jackalman, Monkian, and Vultureman.
Raqquill Rqazz (but I've read before that he's supposed to be the earthling Biff Beastman)
Squidish Rex
Kreannot NHorosh
and
Malcolm