Why do any men care if their wife changes their name?

I don’t get it. Even putting aside my pro-feminist feelings, I really don’t give a damn if my fiancee changes her name when we get married, because shock it doesn’t actually effect me. It’s her issue, and she’s the one who has to deal with it. Further, it’s not like she’s changing who she is or her family allegiance, so it doesn’t make sense to me.

Can anyone tell me why any (heterosexual) men DO care about this? Is it really a possessiveness thing? Is it just a matter of following tradition?