I changed my name to my SO's last name this past January (We are straight, just have made the decision not to marry). He adopted my dd and I didn't want to keep my exhusband's name, so I changed it to match SO and dd. It was very simple, the attorney who did our adoption didn't charge anything for it, just the filing fee. The judge asked me blanket questions such as if I have any warrants out for me, hiding from debtors, etc.. and then he signed it. It was really easy.