Definition of "Surtur"

(Muspelheim, we suppose, with its numerous fiery inhabitants, and their mighty chief Surtur, the dark, the incomprehensible, the great evil principle, had no beginning; or if it had, the Odinian theologians were unacquainted with it.)

1839, Samuel Astley Dunham, History of Denmark, Sweden, and Norway‎, volume 2, page 44

We must also remark, that in the Eddaic Poems there is no mention made of Surtur and the Elves of Light existing in Muspellheim previous to the formation of Ymir, […] .

1847 , Paul Henri Mallet, Thomas Percy (translator), I. A. Blackwell, Walter Scott (editors), Northern Antiquities, page 496

In Journey into Mystery #97 (1963), writer/editor Stan Lee and artist/cc-plotter Jack Kirby introduced their version of Surtur, one of the greatest enemies of the gods in Norse mythology.

2006, Gina Renée Misiroglu, Michael Eury, The Supervillain Book: The Evil Side of Comics and Hollywood, page not identified