Please note for FAFSA:
You must change your last name at the Social Security Administration. Once their system processes the change, you will then need to update the name associated with your FSA ID. Log in using your FSA ID and go to “Personal Information” under “Settings” to update your last name.
You should also change your name on your Free Application for Federal Student Aid (FAFSA®) form. If the last name on your application doesn’t match the last name of your FSA ID, your FSA ID won’t work properly.