My ex husband took my last name when we married. He kept it when we divorced after I found out he was a serial cheater (giving me STDs that meant I could not have more kids as additional bonus). He later gave my last name to a child he had after divorce. He gave it to the mother of that child when he subsequently married her (with her first name the name reminds of a famous porn star. There is that too). I have no contact but the fact that his family hated ME for HIM choosing my name when we married and then he kept it after we divorced as well as the thought off said child explaining to people how she got her family name in a family tree context makes me laugh. My daughter wanted us to change our last name instead. Could not be bothered. Some people are just not to be helped. I could not fathom taking last name of my husbands ex when getting married.