Norwegian words I know only because of metal:
Runhild Gammelsæter (“hot”)
No other language has had such an impact on metal. There’s English, of course, and German, but they are companion Germanic languages to Norwegian.
Ironically, the black metal linguistic resistance to globalization has backfired. Now bands and musicians worldwide routinely adopt Norwegian-sounding names. Hopefully this nonsensical practice will fade as Norway’s influence on black metal wanes.
If black metal had developed in, say, Spain, maybe bands would be singing about the sirocco winds. So grim, so warm!