If you have more than one iPhone, iPad or iPod touch, you probably want to give each one a unique name so you can tell them apart. Or you might be upgrading from an iPhone 4 to an iPhone 4S, like I did. If you give every device a unique name, you’ll be able to identify each one when you sync it in iTunes or pick it up from the desk you share with your family.
Apple has provided two ways that allow you to change the name of your iOS devices.
Renaming an iOS device in iTunes is easy. Simply find the device you want to rename under Devices in iTunes and click on the name to edit it. Once you’ve completed your changes hit Enter and the new name will be saved to the device.
Renaming in iOS
Renaming a device in iOS on the device itself is just as easy as it is to do in iTunes, but for a few more steps. You’ll need to open the Settings app, tap General, tap About and then tap Name. Now you’ll be able to edit the name and once you are satisfied just tap Done on the keyboard or exit the Settings app to save it..