Mashable's roundup of the best Wifi names ever is pretty funny. Being a child of the '90s, I was quite amused by "Pretty Fly for a Wi-Fi." I feel like I need to step up my naming game... mine's pretty generic (when it works).
I'm sure it's probably fairly common in geek circles, but mine is "The Force." Every time a friend is over and connects, I get to tell them to use the force. It makes me smile, and that's what counts :).