Board Thread:General Discussion/@comment-98.218.70.24-20150317164438/@comment-24113789-20150412051144

I didn't really read the whole discussion, so excuse me if I bring up some points that have already been argued.

It's always been my assumption that family don't have the same last names in Remnant; based alone on Ruby's family, it seems like married couples both keep their original surnames and the children choose one. It's also possible that they don't even have "surnames" and the whole name is a given name (I always did wonder whether the Schnees were actually named after the company).

That being said, it's pretty clear that Ruby took her mother's surname and symbol. Yang probably knows her mother's name, but chose to take her father's name. It is possible that Yang isn't eager to claim her mother (I couldn't help but notice the bitterness in her face upon meeting Raven), but she also might be trying to keep this secret from Ruby.

I'm inclined to assume that Ruby doesn't know. Yang was told too soon; and what with the disaster this caused, resulting in both girls nearly being devoured by Grimm, Taiyang would be very hesitant to tell Ruby. Add this to the fact that Taiyang is very protective of Ruby to the point of annoying her (the rolled eyes when she mentions this to Penny, the exasperated "ERRR, you sound like Dad!"), it seems somewhat out of character for him to let her know.