The Book of Lost Tales
In "The Book of Lost Tales", Tolkien describes "Kosomot", the original version of Gothmog, as a son of Morgoth and the ogress Fluithuin or Ulbandi. "Gothmog" is Sindarin for "Dread Oppressor". "Kosomot" is often considered Gothmog's Quenya name; however, in the Quenya name-list of "The Fall of Gondolin" another version appears, "Kosomoko".