Identify and name devices behind router?

I have just set up NextDNS on my laptop and on my router (a Fritzbox). I have many devices in my home network, many of which I cannot or will not install the NextDNS app or config. Still, I would like to identify all devices in my network that make requests via the router. Currently, I just see the n name of my router in the logs or a MAC address.

Is there any way to identify and name (and then filter by) the devices with no NextDNS config/app that make their request via the router? Basically a mapping from MAC address to a device name that is then available in the list of known devices?

And if such a list of mappings from MAC to a device name could be imported from a Fritzbox (or a CVS or a text file) somehow, that would be super cool.