Using
http://www.google.com/trends , I looked up every player I could think of. The percentage next to the name is the number of searches relative to Phil Ivey:
100% Phil Ivey
82% Daniel Negreanu
70% Tom Dwan
58% Liv Boeree
52% Phil Hellmuth
50% Doyle Brunson
40% Pius Heinz
40% Vanessa Rousso
36% Viktor Blom
34% Gus Hansen
30% Chris Ferguson
30% Stu Ungar
28% Tony G
26% Howard Lederer
24% Annie Duke
24% Phil Galfond
20% Phil Laak
20% Sandra Naujoks
20% Kara Scott
18% Patrik Antonius
16% Ben Lamb
16% Jason Mercier
12% Jonathan Duhamel
10% Maria Ho
10% Mike Matusow
10% Vanessa Selbst
6% Dario Minieri
6% Chris Moneymaker
A caveat:
I excluded players who are famous for reasons that have little to do with poker (Jennifer Tilly 214%, Victoria Coren 82%, Jerry Buss 22%, Gabe Kaplan 18%, Guy Laliberté 10%.) And also players who share a name with a more famous person or have a very common name (Phil Collins, David Williams, and many others.)