and frankly, with all of the step- and blended families out there these days, there may not be the stigma that there used to be attached to the idea of having a parent with a different last name. I know that kids go through a stage where they like things to fit in predictable boxes, but things have changed out there.
If I were to get married (at my advanced age, LOL!) I'm not sure I would change my name, but then I'd be trading for something much more complicated than my own. I do like the idea of using the other parent's last name as a middle name, though. My aunt did that with her second son, in part because there was no male on her side to carry it forward.