My name doesn't matter. I never keep the same one for more than a few days.
~ Maya Brooks
Villains whose real, given names are unknown (if they had one to begin with, e.g. The Thing), simply forgotten (e.g. Cheryl Tunt), are unpronounceable by human language (e.g. Glgrdsklechhh), or are known only by aliases or conjectural names (e.g. Maya Brooks). Such villains can be enigmatic.

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