In order to write/change a name of Bluetooth devices, open Devices and Printers from Start menu, right-click the Bluetooth enabled device and select Properties. If you can't see the device in the Devices and Printers section, make sure that it is correctly connected and its drivers are updated. After that, open the Bluetooth tab, type a name in the provided section and press OK. For further information, I suggest you check the official support page.
