Yi is in the given name of Ziyi (子怡) Zhang (章), a Chinese actress and model born in 1979. She is known for the role of Chiyo/Sayuri in the 2005 American movie: 'Memoirs of a Geisha'.
Yi is a genus of scansoriopterygid dinosaurs from the Late Jurassic of China. Its full name is Yi qi, and bears the distinction of the shortest scientific name for a dinosaur.
I wouldn't say that 怡 ("joy, harmony") is usually only feminine. I have a close male friend with this character in his name, and trust me, his parents aren't the type to give their son a girl name. :)