To change the name on your certificate just do the following:

1) Update your name on your account

When signed in, you will need to go to your profile in the top right corner, then Profile and the Edit.

Here you will be able to change your first and last name along with your email address. You just need to ensure that you Save Changes at the bottom of the screen.

2) Access your new certificates

When signed in you will need to go to your Profile in the top right corner, this will open a dropdown menu.

Then you will need to hover the mouse over Course and then click on My Certificates.