In the preface to The Lord of the Rings: A Reader's Companion, authors Wayne G. Hammond and Christina Scull mention a surprising fact:
Dr. Richard E. Blackwelder once counted in The Lord of the Rings 632 named individuals (of which 314 are in the Appendices), a number which soars to 1,648 when one adds titles, nicknames, and descriptive epithets (Sauron alone has 103).
- The Lord of the Rings: A Reader's Companion, p. xii
I can think of several names and epithets related to Sauron: The Dark Lord, the Enemy, the Lord of Mordor, the Eye, the Nameless, the Great Foe, and of course, he is in fact the title character of the series - the Lord of the Rings. In other works, he is called Mairon, Annatar, the Necromancer, the Fair, etc.
Robert Foster's Tolkien's World From A to Z: The Complete Guide to Middle-earth lists 32 titles, names, and epithets, only about a quarter of the number mentioned by Hammond, Scull, and Blackwelder.
The Complete Guide to Middle-earth, Robert Foster, p. 438
But still, if you had asked me how many titles, names, epithets, etc, are attributed to Sauron, I probably would have said something in the neighborhood of 20. I was shocked to read that the number is so much higher: 103!
Has anyone compiled a list of all these names, titles, epithets, and so on?