Looking at it a different way, almost 11 years ago I had a baby, Her father and I were planning to marry (which we did) so I gave the baby her fathers surname. As I said, we did end up getting married, but like many marriages these days it ended in divorce. I kept my married name so that I would have the same surname as my daughter. This was all fine and dandy untill I remarried and changed my surname. It was something that meant a lot to me at the time but when I look back now, the important thing was all time and love that I put into her, not what our names were and while I admit it would be nice to be able to change her name to be the same as ours now, it's not something that is worth causing trouble about.
I guess that no matter what you decide, you can never really tell what the future holds.
Erin,W.A. kids 12,5,2 and 1