Heres the top player from each letter of the alphabet (using surnames as Wta does)
As of October 23, 2006
Arvidsson, Sofia - 40
Bartoli, Marion - 19
Clijsters, Kim - 6
Dementieva, Elena - 7
Errani, Sara - 164
Fedak, Yuliana - 65
Groenefeld, Anna-Lena - 20
Henin-Hardenne, Justine - 2
Ivanovic, Ana - 15
Jankovic, Jelena - 12
Kuznetsova, Svetlana - 4
Li, Na - 23
Mauresmo, Amelie - 1
Nakamura, Aiko - 62
Oprandi, Romina - 50
Petrova, Nadia - 5
Quercia, Federica - 439
Rezai, Aravane - 61
Sharapova, Maria - 3
Tanasugarn, Tamarine - 73
Uberoi, Shikha - 211
Vaidisova, Nicole - 11
Williams, Venus - 53
Xie, Yanze - 266
Yakimova, Anastasiya - 69
Zvonareva, Vera - 26
Highest Ranked players whose not top of their letter: Martina Hingis (8), Patty Schnyder (9), Dinara Safina (10), Anna Chakvetadze (13), Francesca Schiavone (14)
Lowest Ranked players whose are top of their letter: Federica Quercia (439), Yanze Xie (266), Shikha Uberoi (211), Sara Errani (164), Tamarine Tanasugarn (73)
As of October 23, 2006
Arvidsson, Sofia - 40
Bartoli, Marion - 19
Clijsters, Kim - 6
Dementieva, Elena - 7
Errani, Sara - 164
Fedak, Yuliana - 65
Groenefeld, Anna-Lena - 20
Henin-Hardenne, Justine - 2
Ivanovic, Ana - 15
Jankovic, Jelena - 12
Kuznetsova, Svetlana - 4
Li, Na - 23
Mauresmo, Amelie - 1
Nakamura, Aiko - 62
Oprandi, Romina - 50
Petrova, Nadia - 5
Quercia, Federica - 439
Rezai, Aravane - 61
Sharapova, Maria - 3
Tanasugarn, Tamarine - 73
Uberoi, Shikha - 211
Vaidisova, Nicole - 11
Williams, Venus - 53
Xie, Yanze - 266
Yakimova, Anastasiya - 69
Zvonareva, Vera - 26
Highest Ranked players whose not top of their letter: Martina Hingis (8), Patty Schnyder (9), Dinara Safina (10), Anna Chakvetadze (13), Francesca Schiavone (14)
Lowest Ranked players whose are top of their letter: Federica Quercia (439), Yanze Xie (266), Shikha Uberoi (211), Sara Errani (164), Tamarine Tanasugarn (73)