Yes, you should be worried! It’s a big bad world out there and if your PC reports a network name that doesn’t look right, why would you not be worried?
I’m glad to report that my machine is now reporting everything OK, but not without another phase of weirdness. It also went through a phase of reporting that my network adapter was something different than I knew it to be (see this thread https://forum.avast.com/index.php?topic=195630). To cut a long story a bit shorter, I went to the website of my adapter manufacturer, downloaded the latest driver, and after a couple of hours when I haven’t had so much fun in Device Mangler since the good old days of Windows 98, I ended up with my network adapter and my network both being reported accurately (see attachment).
I have no idea about the low level techy details of networks or routers or adapters or protocols, and I don’t want to. But I do know that if my network is being reported as other than I know it to be, and/or my network adapter is being reported as other than I know it to be, I should be worried.