@cdlvj130 

Usually the first part of the name might give you a clue, but the only reliable way is to use the Deco App and see the IPAdddress of the device, and tne go to ALL your devices and get a list of those device IPAddresses. Then go back to the Deco App and change the NAME of the device with the Deco app.

Altermatovely. using the Deco app, TURN OFF all devices. Then power them on one at the time, see what connects on the Deco App, and then change the name for it.