Rename or force restart your Apple TV with few easy steps

On earlier-generation of Apple TVs, you could rename the device by proceeding toSettings > General> Name. Now with the recent fourth-generation TVs, settings have been altered.

• Initiate the Settings.
• Roll down and pick AirPlay.
• Then, choose Apple TV Name.
• Choose a name from the record, or either you can roll to the foot of the page and opt for Custom Name and enter a name of your choice.
• After picking a name, push the Menu button on the remote control in order exit the Settings menu.

Source: http://kecodoc.com/the-tittle-is-coming/