Editing the device name on your Xperia smartphone or tablet changes the way it is seen by other devices. This is the name, for instance, that appears when you pair your Xperia device via Bluetooth, or when broadcasting your cellular data connection as a hotspot. Xperia devices run on the Google Android operating system. If you're running Android 4.2 or later, take advantage of the Settings app to change the name of your Xperia device.
Tap the "Settings" icon on your list of applications to launch the Settings app. The Settings icon is identified by a small gear or cog. You may have to swipe through your home screens to find it.
Scroll down through the list of items in the Settings app and tap "About device," "About phone" or "About tablet." Which of these options you're presented with varies depending both on the Xperia device you're running and the version of Android installed on it.
Tap "Device name," enter a new name for your Xperia device in the provided field and tap "OK" to save your changes.
Google added the ability to change a device’s name in Android 4.2. You cannot change the name of your Xperia device if it is running a version of Android prior to 4.2. To check which version of Android you’re running, launch the “Settings” app and select “About device,” “About phone” or “About tablet,” depending on which option is presented. The version of Android you’re running is displayed under the Android Version heading.
If you’re running an older version of Android on your Xperia device, you can upgrade to a more recent and compatible version for free through the Settings app. Before you proceed, back up any data you want to save and plug your Xperia device into its charger to ensure it has power throughout the upgrade process. This step is essential. If the battery dies during the upgrade process the phone becomes inoperable. Launch the Settings app and select “About device,” “About phone” or “About tablet,” depending on which option is presented. Tap “Software update” to have your device check for available updates. Depending on which version of Android you’re running, you may have to tap “Software update check” to initiate this process. When prompted, confirm that you want to update the device. Reboot the device when the upgrade completes, open the Settings app and edit the device name as described above.