Rename a paired or saved Bluetooth enabled device
You can change the name of a paired or saved Bluetooth enabled device as it appears on your BlackBerry device.
On the home screen, swipe down from the top of the screen.
Settings > Networks and Connections > Bluetooth.
If the Bluetooth switch is off, turn it on.
Touch and hold the device you want to rename.
In the Device Name field, enter the new name for the device.