Board Thread:General Discussion/@comment-27596920-20141205004927/@comment-4010415-20141218012235

Just in case you don't believe that Raven looks a lot more like Yang than Ruby, here's a picture that displays just that.

And yeah, her name is Raven Branwen. It really was in the credits. Someone with the username Montyoum edited the Qrow page in 2013 to say Qrow's last name is Branwen. Source