Board Thread:Speculation House/@comment-24.247.91.107-20140511154823/@comment-26091578-20150211162531

Yang bears her fathers last name because her mother abandoned them regardless, he had absolutely no reason to give Yang the surname of her mother.

As for Ruby, perhaps Summer was the type of woman who dont take no shit from no man! Either way Taiyangs name already had a successor so he mustve been okay with Ruby taking the name Rose. Also cuz alliteration