half the names that aren't that intuitive at all were born out of random inside jokes that higher level people came up with and lower level players just parroted it - that's the only reason I've ever encountered for cheese on snakewater, the only reason I ever heard for people calling that area al qaeda was because wonderwall did it, and people called the area underneath snakewater second africa because of a joke post from gotfrag or natf2, I can't even remember which posts were on what forum anymore.
there are some other names that come from decals on the map that you can't see with fps configs and shit turned on - what people call shithouse on badlands was called maintenance at one point in time for this reason
http://i.imgur.com/DpbZaSF.jpg