Talk:Volume 2 Trailer/@comment-24.191.22.123-20140707211337/@comment-14640999-20140718002448

(doublepost because lag)

it is possible that their parents split up while their mother was pregnant with Ruby, and Ruby was given her mothers maiden name, while Yang's name was more closely associated with their dad's. (this could be due to a number of factors, such as Yang having the same eye colour as the father rather than mother, or something.)