We bought our first car GPS in 2009. We set it to the male Australian voice, just because it's the sexiest of the lot of 'em. Garmin names this voice "Lee", so we started calling the GPS itself "Lee".
When we bought an updated model this year, we gave it the same voice, put it in the newer of our two cars, and christened it "New Lee" (say it fast). The original one was moved to the older car, and renamed "Original Lee".
In my work van, I have yet another unit, and have programmed it the same as the others. My name for it: "Professional Lee".