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In the next window, review the display setting for your name and enter your password if you are happy with the modification.
Click on the ‘Save Changes’ button to confirm the operation.
Your name will now be updated to the new entry. Keep in mind, once you change your name on Facebook, you will not be able to change it again for 60 days. So make sure you are 100% sure about the name change before you follow through with it.