Board Thread:General Discussion/@comment-14640999-20141031215933/@comment-3257939-20141102063534

The main problem with that is the fact that Yang's last name comes from her father and not the mother. Her father is Taiyang Xiao Long and her real mother was a mystery until Summer died. So she couldn't have changed her last name because of her biological mother. I think the only one who could have changed her name is Ruby. In case she did.