Device names in WiFi hotspot client list

[Swamp Thing]

The personal hotspot in Android has a Connection Management feature that lists the devices that are currently connected to it. I see that some devices are identified by name, like "raspberrypi" and "ESP_AEEB39" (which is a smart plug). But some devices are just identified as "Wireless device". This is the case with my Android tablet and spare phone. In all cases, the MAC address is shown below the respective name.

I'm just curious why some devices don't get displayed with their actual names as configured in their setups.