Every once in a while, someone says this, which makes the time I wasted accumulating the following list slightly less worthless.

Elayne (Trakand) and Ellorien's grandmother (Elayne Traemane, after whom Elayne was named),
Kari Thane (one of Egwene's friends) and Kari al'Thor (Rand's mother)
Adrielle Aes Sedai of the Grey Ajah and Adrielle of House Baryn,
Aeldra, a character named but who never appears and Aeldra Najaf, Aes Sedai of the Blue Ajah,
Aldin, an Amadician gai'shain and Aldin Miheres, a mercenary in Arymilla's employ,
Andaya Forae, Aes Sedai of the Grey Ajah and Andaya Murasaka, an acrobat,
Ander Corl and Ander Tol, both Cairhienin commoners,
Ban Crawe and Ban al'Seen, both Two Rivers Folk,
Bari, a servant in the Royal Palace of Caemlyn and Bari, a juggler in Valan Luca's circus,
Bili the bouncer from Easing the Badger and Bili Mandair, a child born at the end of the Aiel War as well as Bili Adarra, Bili al'Dai and Bili Congar, all three Two Rivers Folk (and making a total of five Bilis)
Prince Consort Brys of Kandor and Lord Brys of Tarabon
Chin Akima and Chin Ellisor, the first owns a circus, the second is a ship captain,
Cian, a Tairen, and Cian do Mehon a'Macansa, a Murandian Lady,
Dag Coplin the old, and Dag Coplin the young, both Emond's Fielders,
Dailin the Shaido Wise One, and Dailin the Taardad Maiden of the Spear (and Aviendha's second-sister),
Dorindha the Goshien (Bael's wife and Melaine's sister-wife) and Dorindha the Taardad Maiden of the Spear,
Eldrin Cauthon, Mat's sister and Eldrin Hackly,
Elisa al'Vere (Egwene's sister) and Elisa al'Seen, both Two Rivers Folk,
Eward Aybara (Perrin's uncle), Eward Candwin and Eward Congar, all three Emond's Fielders,
Flann Barstere and Flann Lewin, both from the Two Rivers,
Get Ayliah and Get Eldin, also both from the Two Rivers,
Gwil of the Two Rivers, and Gwil (Nermasiv?) Areina's brother,
Had, Had, and Had al'Lora, three Two Rivers people,
Haesel, a servant in the Tarasin Palace and Haesel Palan, a Murandian merchant,
Hal of the Two Rivers and Hal of Gawyn's Younglings,
Haral, a Two Rivers man who dies in a Trolloc attack, and Haral Luhhan (you know who he is),
Hari Coplin and Hari, a thug in Masema's service,
Herid the Darkfriend and Herid Fel, as NaClH2O noted,
Hu Marwin, Hu Barran and Hu al'Dai, all Two Rivers folk still,
Huan, Siuan's uncle, Huan, High Lord Turak's so'jhin and Huan, the Tairen captain (can't be Siuan's uncle, that one died saving children from a fire),
Ines, a Cairhienin rebel, and Lady Ines Demain of Kandor,
Ivon, a Cairhienin knife-maker and Ivon, a Whitecloak (I was looking for Alanna's Warder, but his name is Ihvon, so it doesn't count),
Jac al'Caar, Jac al'Seen and Jac Coplin, of the Two Rivers, plus Jac Wynn of Murandy,
Jaem, Vandene's Warder and Jaem Dawlish in Caemlyn,
Jaim, one of Lan's soldiers at the end of New Spring, Jaim Adarra, a captain (isn't Adarra a Two Rivers name? There was a Bili Adarra earlier...) Jaim Aybara, Jaim Dawtry, Jaim Thane and Jaim Torfinn, all four Two Rivers folk, and making Jaim, with six individual uses (and you said no name was used twice ), our most frequent name thus far,
Jak Masond, of the Legion of the Dragon, and Jak from The Dancing Cartman (and let's not forget Jak o' the Shadows, our friendly poetical visage of death),
Jennet, Aes Sedai of the Grey Ajah and Jennet of Murandy,
Jeral Florry of Aringill and Jeral the Whitecloak,
Jon of Jarra, Jon Skellit the barber and spy, as well as three Two Rivers Jons: Jon Ayellin, Jon Gaelin and Jon Thane,
Morvrin's Warder Jori and Jori Congar of the Two Rivers,
Jorin Arene, a Darkfriend in Amador, and Jorin din Jubai White Wing, as you can guess of the Sea Folk (a Windfinder),
Jurad Accan, an Andoran, and Jurad Shiman, a Kandori (though both soldiers),
Kin, one of Valan Luca's jugglers, and Kin Tovere, whose name appears in a chapter title (The Craft of Kin Tovere),
Lady Leilwin, a Taraboner, and Leilwin Shipless, better known as Egeanin,
Lem Thane and Lem al'Dai, from the Two Rivers,
Maigan, Aes Sedai of the Blue Ajah and Maigan Nem of Kore Spring,
Marisa Ahan and Marisa Ayellin of the Two Rivers,
Marith Riven, a young Aes Sedai, and Marith Jaen, the Amyrlin Seat who preceded Siuan,
Meri, Egwene's maid, and Meri do'Ahlan a'Conlin, a Murandian Lady,
Nela Thane and Nela al'Caar, of the Two Rivers,
Paetram, a merchant of Kandor, and Paetram Aybara, Perrin's brother,
Paitr Conel, the idiot Darkfriend and Lord Paitr do Fearna al'Conn, a Murandian Lord,
Pel of Lugard and Pel Aydaer of the Two Rivers,
Rashan, Erian Boroleos' Warder, and Rashan, Graendal's dead servant,
Rovair, a Cairhienin rebel, and Rovair Kirklin, Masuri's Warder,
Saml al'Seen, the Two Rivers Asha'man, and Saml Hake, the thin innkeeper,
Sedrin of Valan Luca's circus and Sedrin a'Conlin, the Murandian noble child,
Susa al'Seen of the Two Rivers and Susa Wynn of Murandy,
Tad of Emond's Field and Tad Kandel the Andoran Redarm,
Thad Haren of Kore Springs, Thad Torfinn of the Two Rivers,
Toram, Cargomaster on the Sea Folk Wavedancer and Toram Riatin, our favourite corrupted Cairhienin noble blademaster rebel,
Wil al'Caar and Wil al'Seen (you guessed it, from the Two Rivers),
Wit Congar and Wit al'Seen, also Two Rivers.


And innumerable characters whose names are almost the same, which are probably the equivalent of Henry/Henri or Pierre/Peter/Pedro and the like.