 Several of the towns, cities and summon forces in the game have  derived their names from Norse mythology, such as Midgar which is  derived from the Norse word Midgard which is where humans were put  by the gods to protect them from the giants, or Nibelheim which is  the land of the dead (which is very apt when you consider the town  is full of Sephiroths clones who are basically the walking dead) and  also literally means fog home or mist home, revealing the true  name Clouds home. One of Clouds swords which is called the  Ragnarok which is the Norse doomsday. They Ragnarok appears in  several of the Final Fantasy games such as, FFVIII, FFX