Same gender: Neko Case, Jem, Poe, whichever member of The Breeders is the one with the sort of throaty voice (the one that does lead on "Drivin' On 9"), Carol van Dyk, Storm Large, Kathleen Hanna.
Not the same gender: someone said Zach Condon and Jeff Buckley and I agree. Also Britt Daniel, A.A. Bondy, Neil Hannon, and Hawksley Workman. And Guy Garvey.