This is a bit of an odd quiz. You've basically got to think of as many NBA players as possible. They've been categorized in sets of 20 in order of how many points they scored (or have scored so far) in their career - so guessing young players and bench players gets you a lot of the lower categories.
If there are fewer than five players with the same surname, you can just type in the surname, but you have to give the full name if there are more than five of them (there are 64 Williams). So you have to type in "Blake Griffin" in full (and Taylor Griffin is a good one).
See how many you can get:
http://www.sporcle.com/games/darinh/400 ... ed/results