My DH's parents are not together, and DH has his father's surname. My MIL and FIL do not get along at all, and FIL has not been involved in my husbands life. That being said, I asked my husband once if he wishes he didn't have his dad's last name and he said no. He's really glad that he has his dad's last name regardless of how absent he is because he is still his father, that's his blood and history and nothing can change that. MIL's gone through 3 husbands and taken on and changed her name every time...so where would that have put DH? Constantly changing his name? He says it was hard enough growing up with a single mom, he's glad that he had his dad's surname.