Well, I'm from Canada, so these informal rules are the same as the United States, but for me personally, I will not be changing my last night. It means to much to me and my boyfriend and I have discussed that and his is okay with it. I think he was a little sad at first when I told him, but he's had lots of time to get over that! haha I love my last name, it's me! It's who I am. As far as our kids, they'll get his last name, that's okay to me.
I do think it's a silly tradition...plus the father "gives" away his daughter, like she is an object. Obviously, we don't think like that anymore, but it is still in the marriage ceremony. It's interesting to think of it like that. We all just do it, but when you think about it, it's a little weird, and VERY outdated. I totally don't mind my Dad giving me away, because it's that thing you do in the ceremony, but when you really think about it, it's totally dated and sexist. I think it should be a choice, as in, perhaps the Man can take the woman's last name, or you just keep your own last names, like my boyfriend and I will be doing.