Well... graviton is more of a force than an energy. It took me alot of will power to avoid making a sonic weapon. But it is a start.
Other names I have already done that I actually like and am probably keeping are:
LG-17R Laser Gun version 17, red (the pistol)
G-8 (deagle thingy. As it is only one letter, I cannot think of anything for it to stand for, but it does sound cool)
PG-01 Prototype G version 01 (the one claw thing)
HDPE High density photon emitter (the next gun I am doing, this one is a bit more fancy so I will not say what it does yet)
X9-Auto (The ALR-24, I forgot I renamed it. Again I do not know what it stands for)
Proto-17 (not pictured yet)
Thats all I have so far, and with 16 guns total, you can see I need some help with names.