User blog comment:FinalWholockianGrrlGamer/Headcanon: Summer Rose/@comment-10390252-20131216165227/@comment-24113789-20140126014246

Hmmm... good theory, but just as a little nitpick I think that it makes more sense for Yang to use their mother's maiden name and Ruby to use her father's surname. It matches up with the characters better, and also Summer (assuming Ruby's parents were married) would presumably have had her husband's surname on her gravestone.