Depends on what she wants to do and how cool her last name is. If I marry a girl with some awesome sounding last name like 'Ironwood' or the like(and I wanted to be associated with her family) I might even take her name. My brother and I are the last ones in our family to carry my Grandfather's surname though, since he had 3 daughters and our mom was the only one to have any children before she got married. My brother has a son, so the name is sure to go on at least one more generation, but I do feel some duty to do my part. Like someone else said though, I could kinda dig a hybrid last name.