I have a Giant Sedona that I use for lugging the kids around, errand runs, etc - I named it "Hoss" because the damn thing weighs a metric ton. I once got into a head-on collision with a Volkswagen Beetle on it; the VW was totaled but everyone was OK and I rode off after about 45 min.
That was my first "adult" bike....my 2nd bike is after realizing that I really enjoyed riding, I decided to get semi-serious about it and bought a Diamondback Podium 1 from a friend. He had named it Blue (because it was blue, I am guessing) but for me, the difference between turning a pedal on the Giant vs the DBR was night-and-day; the DBR just shoots out and weighs nothing, so I decided to call it "Lightnin".