I don't know why Nintendo thought marketing a purple console was a good idea. That said, if you removed the handle of the black or platinum Gamecube, it's actually a pretty normal looking console and "Gamecube" is a totally appropriate name because the console is, in fact, cube-like in shape and it played games. Obvious name is obvious.
On a related note, I almost never used the handle when moving my Gamecube because I was so used to consoles NOT having handles. Who would have ever thought? I have small hands and was still able to grip the control comfortably with one hand. Unnecessary handle is unnecessary. So much for THAT idea, Nintendo.