My touring bike is "Orginal Cindy" & my OH's touring bike is "Aeryn Sun". I won't lower the tone (again) on the explanation of their names, if you can't guess you really have no imagination.

The other bikes we have not really had long enough to really work out their charactors... but currently they are "my road bike" "your road bike" "my mountain bike" "your mountain bike" and range in age of 5 months to a 2-3 weeks old, so probably don't need naming yet!
the car (VW passat 1.9 tdi) gets called "the tank" because it drives like one compared to either my old car (audi A4 quattro 2.8 v6) or any of the bikes.