I associate the word "Gosu" with the Korean/International StarCraft scene, where the word describes a very skilled player. I wonder the project lead was also thinking of that.
Heh. Well, although the lead is probably several degrees removed from the StarCraft gaming world, the Korean meaning of the word did play a part. But, honestly, there are only so many 4 or 5 letter words that start with G and also have an S.