Well it seems as if there were 99958 others using the initials TJ when I chose it. Besides, tj sounds a lot better than many of the other things I've been called.
Did you try all 99,958 other ones? Are you sure "tj00004" wasn't already taken? I'd've just saved the time and covered all other bases with something like "tj8billion". Then if everybody else in the world had taken all the tj names, you'd still have some wiggle room.