Wifi and the Ex

I have a rather complicated, and unusual question. I'm at the start of a divorce with my husband, who disappeared two weeks ago when he knew I was going to raise domestic violence charges against him. Now comes the wifi part.

I received a new laptop on Monday. When I had it begin looking for my already-existent wireless network Monday evening, it found several of my neighbors' networks (I know this because most of the connections are named after various neighbors, only a couple connections have ambiguous names), and not my own.

The next day I had Bright House out to troubleshoot this for me. While I am tech savvy, I'm ashamed to say I never learned the first thing about wireless networking.

The technician said the reason my laptop couldn't find my wireless connection was because I needed the key Bright House assigned me when they first setup the router back in December. This seemed a reasonable theory to me.

But here is where the plot thickens: among the neighbors' connections that my laptop was finding, it began finding a connection named, "MYLASTNAME".

Now I'm worried that my husband hasn't strayed as far from home as I had hoped. The only connection established on the router was the one Bright House made in December, and that one had simply been named "wireless".

The technician made a new ID and a new key for me, not that I feel entirely safe. On the Bright House website I found out the only security they provide on wireless networking is WEP. Not that hard to crack, I hear.

Today I tried an experiment, just to be sure the connection bearing my and my husband's last name isn't somehow coming from my own router. He did get a new laptop himself before he left, and I new he'd been messing with the router.

I unplugged the power cable from my router, which obviously caused my connection to disappear from the list. Simultaneously the connection bearing my last name had disappeared too, but it reappeared shortly thereafter while the cable was still unplugged.

That was the background of my situation, now here are my three big questions:

Am I right to think that if I still see that connection with my last name on it, a connection never created by myself nor my ISP, when my own router is unplugged, the connection is being generated elsewhere?

Can I somehow trace the connection bearing my last name to see where it's coming from? In other words, as odd as it sounds I'm paranoid that my husband is staked out at one of the neighbors' houses. Can I pinpoint the origin of this connection?

Before disappearing, my husband did spend some time at the next door neighbor's place. If he had used their wireless network to access the internet, is it possible there's some sort of ghost connection left behind coming from their router?

Fin.