I know I asked it, but I'll give my own opinion. If she were a foreigner, lots of countries don't have the same naming customs. But if she's an American, I'd be checking to make sure she isn't some kind of radical feminist. If she's got this idea that the big evil patriarchy is trying to suppress women by taking their last names away, who wants that? And if you hyphenate your last name, and your kids married people with hyphenated last names, your grandkids could end up with a name like Smith-Johns-Philip-Cortez. That's pretty crazy. With all the girls who are not into radical feminism out there, I don't know why a guy would want to marry a feminist who was radical enough not to want his name.My other concern would be that if she doesn't want to take his last name, she might not think marriage will last. Why change your name if you are going to change it back in a couple of years anyway? Having the same family name communicates We are family.Taking his name signifies commitment and taking on the identity of his wife, joining his clan, being his helpmeet, and lots of other good stuff like that. It's a cultural thing, more than a Biblical one. But not wanting to take his name could show some problems with accepting some Biblical principles about marriage. As a man, it felt good to me to know that my wife wanted to take my last name. It's better if your wife feels honored that you would want to give you her name. In my wife's country or her culture at least, the wife doesn't usually legally change her name, though in some context she is called by her husband's last name. (It's complicated. You call them by their first child's name after they have kids, and almost never say their name again in her tribe. My wife has an Uncle Addeline. I gave my first son mine and my daddy's name which worked out well for us.) But my wife wanted my name. We did take a while to get all the paperwork switched over because in the US because we lived overseas for so long and because of costs