Ah, yes I too have hated it when they give you the 4 letter name limit. but I've gotten used to it after playing several games with 4 letter limits. I tend to use these names:

Demi- BM or Thief
Ryu- Monk
Ash- Fighter/RM
Chaz- Monk/Fighter
Bleu- BM
Fayt or Fate- Fighter or WM
Jet- Fighter, BM
Nina- WM
Arté- Thief
Sol- Fighter
Jin- Fighter/Monk

I don't really like those typical americanized boring names like: Mike, bob, jim, joe. They seem so casual and boring. Anyway, I hope my little list helped.