The asteroid is 6.1km long - about the size of a medium sized Culture ship (tiny compared to a large GSV though) so perhaps "Size Isn't Everything" or perhaps "Pure Big Mad Rock Man".

That was my first thought too, but unfortunately asteroid naming conventions require one word for some reason. Ah well, when people are actually sending robots out to asteroids and claiming them properly we can name a few after culture ships instead.

I think he'd have preferred "Meatfucker".