Surt

In Norse mythology, Surt was a giant who ruled Muspel, the realm of fire and was married to Sinmore. He had a fiery sword which shined more brightly than the sun. During Ragnarok, he will destroy the entire world except Hodmimir's Forest, because that is the only thing his sword can not destroy. He will kill the unarmed god Freyr as well.

Alternative: Surtr

Surtsey is an island named for Surt.