If you wish to change the name on the certificate, you need to first change your name on the profile and then, retake the final assignment and score higher than the previous attempt.
If you do not score higher than the previous attempt, the same previous name will be displayed since the certificate only gets updated with the higher score out of all the attempts. There is no restriction on the number of attempts you can take for the final assignment.
Make sure to have the updated and corrected name before taking the final assignment so that you will receive the certificate with your preferred name.
If you need any assistance, please log a support ticket with us here.