For any bluetooth devices.
- Open "Control Panel" (you can search it Win + "Control Panel").
- Click on "Hardware and Sound" .
- Click on "Devices and Printers". Now if it brings you to Settings, all you have to do is right-click on "Devices and Printers" then select "open".
- Find the device you want to rename and open its properties, by double-clicking it or right-click on the device then select "Properties".
- At the top of the opened window, go to the "Bluetooth" page. Click or double-click the name of the device, finally rename it whatever you want, make sure to click apply and done.
IMPORTANT: If the device's name is still the same as before, simply turn off bluetooth and turn it back and reconnect.