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Hi @pekra
We can't identify on what type of device that uses that name, but you may experiment to identify it.
First, you have to know how many devices are connected and what are those devices.
Second, disconnect the device one by one to see if any of them is using the said name.
If you are not able to identify it, then you may need to change your WiFi password to disconnect the device on the network.
Cheers!
BasilDV