Celtic, Scar, Chopper, City Hunter and Jungle Hunter (assumingly those were CH and JH's names) were nicknames to distinguish the Preds a little better than like this:
Remember when "The Pred that lived the longest and killed the Queen who also teamed up with Lex" fought that alien? Oh no, wait, wasn't that the "Pred who had the cool mask and was really tough"? Or was that the "Pred that almost killed Lex but died because of that alien that was going to have Grid Marks and was probably the Alpha Alien"?
Here is an example with their nicks':Remember when Scar fought that alien? Oh no, wait, wasn't that Celtic? Or was that Chopper, the one who was killed by Grid first?
Heheh, that was way shorter and more understandable. Yes, I think they would have names. I can't really describe anything right now... sorry if it sounds like I don't know what the hell I'm talking about.
"To me, everyone is crazy. The ones in the Mental House just got caught."