If I were an American residing in Canada, can I legally change my?
After some research I had to modify my answer. Apparently the American embassy can accept a Canadian court, they just dont have too. So its case by case. Maybe. Changing your name generally requires an American civil court. An embassy wont change the name on your passport without proof from the court including your new social security card: How to Change Your Name You may be able to go through the process from Canada, but youd need to talk to a lawyer for that.