You can check the Facebook Help Page for more information. The page will warn you not to add unusual uppercase/lowercase letters, and etc. If you use a second name, you can add it. Name and surname must be in the same way as your ID. So, please use only your real information. Follow the instructions below:
Click on the arrow button on the top right of the page.
Then click on Settings & Privacy.
Select ‘Settings’ again and you’ll see the ‘General Settings.’
On General Settings, you can change your name and surname.
Change it and save!
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