In some cases the child takes the mother's surname as a middle name and the father's name as the family name.

VOA: special.2009.07.06

Beatrice is also going to get one and a half of the votes in the middle, so this vote and half the Pierson guy's vote and, I've forgotten your name already, again?

比阿特丽斯同时会获得,中间一个半的选票,这个选票和皮尔逊学院小伙子选票的一半,我忘了你的名字了,请重复一下

耶鲁公开课 - 博弈论课程节选