Hmm I got quite a lot of nick depends how long we have to get back...
My quite recent one are for all the serious forums or computer related one (Javascript/php/C++...) it's Coume (my family name but shorten, was my nick when I was 12-14y.o.
)
The other one is French.Nutter or NuTTerZ, I use them on IRC, or Nightclubbing related forums etc...
and have few others... but coume and NuTTerZ are the more common....
Ludo