I, for one, am glad buggies have names because when I talk about them to people/friends, it is easy as hell to say exactly what buggy I am talking about. The more time passes, the more likely it is an individual would have owned more than 1 buggy, so to say "John's buggy" does not cover what buggy I am talking about.
Buggies have a tendency to take on a personality and having a name goes right a long with it. Frostbite / Green Goblin / Nemesis... I like that they have those names and my brain immediately puts an image in my head of what it looks like.
As for the original thread, I probably would not be the one to rename a buggy. I like the idea of a name sticking. However sometimes you see color changes and overhauls and a name change will occur. 9 finger to Snow white.