[The Barrow-Wight]

From what I know, drow started with Dungeons and Dragons in the late 1970's and did not exist before then. That may not be entirely correct, but they definitely did not exist in Tolkien's Middle-earth. There were Dark Elves, the Moriquendi, who were the Elves that never made the journey to Aman and never saw the light of The Two Trees - thus 'dark' elves.