Amanda Lear, a model/Dali confidante/Bowie pal/Eurodisco singer. Although it’s not totally clear if she was born a woman.
Kim Carnes. I still picture Rod Stewart singing whenever I hear “Bette Davis Eyes.”
Grace Jones.
Imogen Heap. She looks like a man too.
Dee Snyder 
Whichever Pointer Sister sang lead vocals on “Dance Electric”
Kim Carnes maybe a little more Raspy than masculine. I thought it was a guy for a long time because there are men named Kim.
Nah. Her voice is low, but there’s nothing masculine about it.