Joseph Laszlo points to a poll on Wi-fi hotspot SSIDs: "When you think about it, an SSID is a means of self expression, though a limited, and kind of a weird one. You may as well be creative about it."

As here, so with handles for instant messaging (which are a tool for self-expression as well as for identification) and bluetooth device names... I've been using MobiLuck recently to track devices that I get near... leave it for a day or so and then check the list of Bluetooth IDs it's accumulated...