In the most recent gameplay video (Linky: http://www.gametrailers.com/video/e3-2010-crysis-2/101431) the player is called Alcatraz by the US soldier in the car when they arrive to pick him up from the SPOILER which is SPOILING.
Of course, this could be some twisted weird plot where Nomad is actually Alcatraz who's actually Helena from Crysis. Alternatively, the player is actually Alcatraz Island. http://en.wikipedia.org/wiki/Alcatraz_Island
Also, if you think Alcatraz sounds stupid you haven't heard it enough. Listen to that part of the video like 5 times, then it sounds pretty cool and the way it's pronounced sticks.