So maybe it is a currently active network nearby that is being redetected..
1) Would redetected networks show up with the specific names that I'd allocated to them? I'll trawl the registry and see if and where those names are still present.-cranioscopical
If it is a popular in the area ISP generated name, then it could be the neighbors just close enough to look the same SSID.
2) If other machines on my network retain the names of the defunct connections, would that 're-infect' the machine from which the names were expunged?-cranioscopical
While I'm really tempted to say no here …(at the risk of throwing gas on the fire)... It does occur to me that there was a feature similar to that built into Windows devices that shared a Microsoft Account login.
But I believe the act of deleting it from one should also be shared with the others as well. I never played with it because I hate the vary idea of a locally used (Microsoft Controlled) Microsoft Account...I just vaguely recall running across the feature once many moons ago.
Also I really
like Ath's angle above.