It's been…geez, almost ten years since I've read Gilgamesh, so. But I think the names are too close to be coincidental, though this is probably something I should just ask Johnson at Sirens in the fall. I would class it as a retelling, I guess, because I do think, through a very fractured kaleidoscope sort of view, it is playing with the elements of the original and transforming them into something different (and, imo, cooler).