I’m not a fan of how when you have a child they automatically take the fathers last name. This is a relic and the practice of it needs to be abolished. So. I have this simple plan that everyone should follow. If you have a girl, she gets her moms last name. If you have a boy he gets the dads last name. This works quite well assuming that when you are married you each keep your given last names. The time is past where we need to keep these “family” names for historic reasons. I’m sure anyone can trace a family tree from this point forward no matter what names we choose. We just leave so much information out there now a days!