Add combinations of ! _ - . to the names, also add numbers.
So, for example, Agent-Krylov-52 or Agent.Krylov.52
Another thing that doesn't work on all games is adding mixtures of UPPER and lower case letters.
Some games treat, say PeRfEcT and perfect the same, others treat them as different names.
I don't see an "Agent Orange52" on BF2142 though, so you can still grab that if you want it.