To change a student's name on their certificate, navigate to the Users on the website admin dashboard.  Use the search field to look up the user by email, name, or ID.

Click on Edit under the user's profile, then scroll down to the LearnDash Certificate section.

Change the name in the Certificate Name field to the students desired name. 

Scroll down to the bottom of the screen and click Update to save the changes.

Now the student can go to their account dashboard and download a new certificate with the update name change.