Board Thread:Show-Related Questions and Answers/@comment-34924658-20151116043932/@comment-1894786-20151116175256

Eskaver wrote: That's because people like David can't decide.

Red was just use to Ruby at that point. She even said MM to Mulan instead of Snow. Because Mulan had only met Snow as Mary Margaret.

Regardless, whether or not her name is Ruby or Red, her last name probably isn't Lucas. Granny is Widow Lucas because that was her husband's name. Anita was Anita Lucas since she's Granny's daughter. But if Anita was married to Red's father (and there's no evidence to it either way), then Red can't possibly be Lucas.