I asked some people on a non-chess forum, you might not want to include these since the sample is self selected (people who didn't know any might be less likely to respond). I didn't count one guy who listed 17 names. A couple of great answers though.
People - 5
Kasparov - 4
Fischer - 2
Karpov - 1
That Persian Guy - 1
Blue Tooth (Or something like that. That one IBM computer, you know) - 1
A local Chess Organizer - 1
None - 1