Halo 2
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Despite popular belief, Wolfenstein 3D and Doom were not the first FPS games in history. An FPS game called Catacomb 3D predated these two games. It was the first ever FPS game in existence. But you used magic, not firearms. It was an OK game. Released for PC and NES (maybe more).
I find a reasonable game (It is hard to find a great online FPS without downloading) to be a game called Russia's Army. It has 8 player online with a selection of weapons and a nickname. You can find it here: http://www.gamevial.com/russiasarmy.htm
One game on Facebook that is a FPS game is Paradise Paintball or now known as UberStrike Another one I know of is Brave Arms I hope this helps and red crucible
Call of Duty is a First Person Shooter (FPS).
quakelive.com is one of the easiest fps online PC games that you can play.