Yes, this name is of Greek origin. Its original spelling was Χάος (Chaos). Chaos was a primordial being who gave origin to the first dieties -
Eros, Gea, Tartaros, Herebos and
Nyx. The initial letter was pronounced as we pronounce the ch sound of the word "Bach".
In this case, Kaos has been written with the K letter, so the correct pronunciation should be KA-os.
Wise men speak because they have something to say; fools because they have to say something. -
Plato