L.C.
I don't want to come across overly opinionated, but I do have to comment on this as this happend with my huband when he was a child and to this day he still doesn't like that all of the changes happend. I have directly seen how this type of back and forth thought process has directly affected a person who had no control of the situation. My husband was born and given his fathers last name, when his mom and dad broke up his mom changed it to her last name and than a few years down the road married a man and change his last name yet AGAIN to the step fathers last name. Because of this my son now has a last name with no blood connection to any of our family and it really makes me upset. An adult decision was made to give her the last name that she has, when you fall in love down the road and marry will you change it again? If you want her to share your last name, does that mean you will never take the last name of your husband? All of the switching around is confussing and should be thought about in great depth, don't change it now if your going to want to change it again down the road. Might sound like just a quick, unimportant process, but really this is bigger than that. He is still her father too and you may just be setting her up for confussion later. Please really think about the long term before you make any changes.