I see phones that I don't recognize on my network also. Up to three. BestBuy Nerd Squad says they will charge 200 dollars to rid my computer of any unwanted junk.
If you take your computer to BestBuy, those "same" devices will more than likely not show up. So unless you're having them fix/clean other stuff, I don't think it would be worth it. But by all means, if they are able to do something about it (telling you
what they did and what was the cause), and if spending $200 isn't an issue - give it a shot.
if you haven't done so already, you might want to read through the different replies concerning this topic to see why the devices are showing up and what some may have done to fix the issue.
Just my 2 cents... :)
Blessings.