Tired of your nickname on Game Center? Or accidentally registered one that you do not like? Luckily it is easy to change your nickname on Game Center. The steps are not so obvious at first. Follow these instructions to change your nickname:
Open the Game Center app and tap on the “Me” tab. Scroll down to bottom and tap the “Account” banner. On the pop up screen, select “View Account”.
On the Account screen, scroll down to the Nickname field. Tap on it to edit. Click Done to save your new nickname. Your nickname has to be unique. Game Center app will prompt you if the entered nickname is used by someone else.