Villains, families, species, or groups whose real given names remain unknown if they had one to begin with (e.g. The Thing), were simply forgotten (e.g. Witch-King of Angmar), are unpronounceable by conventional language (e.g. Glgrdsklechhh) or are known only by aliases or conjectural names (e.g. Fiamma of the Right). Such villains can be Enigmatic.

Note: Villains who have official names should not be added to this category for obvious reasons.