Ragnarök is the Norse equivalent to the Catholic Apocalypse in the sense that its the final war or the war where everything dies or is destroyed.
However (taken from wiki) only the wealthy and upper-class Vikings had swords as they were costly to make and the size of a Spathae. The battle axe's like Mammen and Dane were much more common. It makes sense to have Warriors weapon named Ragnarok, but the double head axe and/or Labrys is more modern fiction than historical Viking use.
If warriors were based on barbarians like Conan instead of Vikings, then theres a point about the relic name. But right now our War is like a hybrid of the two that leans more toward Viking.