The very fame of Coca-Cola would tend to forbid using “Coke” for something that is not related, then. Kind of makes sense. A less famous name like, say, Domino (sugar and pizza, separately) could be reused for a computer and they would be unlikely to care.
With Duck Dynasty taking off in spades, I wonder if redneck/camo-theme marketing concepts, especially newer ones, are going to come under fire. I think the Duck Commander folks might be less concerned because they have a life (as long as it is not a blatant rip), but A&E could be more prissy about their spin on it.
Someone did use Sugar for computers, then again I’m not sure anyone building a new flavor of Linux, distributed for free, has to worry since its all open source.