The hero can get away with a plain name; the villain cannot. An antagonist's name has to carry menace, distinctiveness and a hint of who they are, all before they speak a line. That is a lot of work for a few syllables, which is why villain naming rewards a little craft. The good news is that the techniques are learnable, and most fall into a handful of moves you can mix to taste.
Lead with sound, not meaning
Before a name means anything, it makes a sound, and for villains the sound does most of the heavy lifting. Hard consonants read as cruel: the k, g, d, t and z sounds feel sharp and cold in the mouth, which is why so many memorable villains are built on them. Long, hissing s sounds suggest something serpentine and untrustworthy. Soft, flowing names can be sinister too, but in a different key, the menace of charm rather than brute force. Say a candidate out loud and listen to how it sits. If it feels comfortable and warm, it is probably a hero's name; if it catches slightly, like a blade, you are close.
Let the meaning whisper, not shout
A name that means "death lord" is not frightening; it is a costume. The strongest villain names suggest darkness obliquely. Lean on associations rather than translations: roots that evoke cold, rot, shadow, hunger or ruin, woven into the sound rather than stamped on top. A name that sounds like "ash" or "thorn" or "gall" without literally being those words gives a reader the feeling of menace and lets them do the rest. Restraint is the secret ingredient. Trust the audience to sense the threat.
Use titles and epithets with discipline
An earned epithet can turn a name into a legend: the Pale, the Deathless, the Unburied. A title can stake a claim to power: Lord of Ash, Warden of Bone. But these are seasoning, not the meal. One well-chosen epithet sharpens a name; three stacked together tip it into parody. Reserve the grand titles for villains who genuinely rule something, and let lesser antagonists carry a single, vivid byname or none at all. The necromancer name generator is built around exactly this pattern of a dark name plus a measured title, and it is a useful place to see the balance in action.
Match the name to the kind of villain
Different villains want different names, and reaching for the right tradition saves you a lot of guesswork. A fallen mage or death-caster wants something gothic and cold; a fiend from the lower planes wants harsh, alien syllables; a corrupted noble or fallen knight wants a once-proud name now spoken with a flinch. The Foundry has a tool tuned for each: the demon name generator for infernal antagonists, the vampire name generator for elegant immortal predators, the tiefling name generator for the conflicted and the damned, and the witch name generator for hexes and cunning folk. Pick the tradition first and the sound falls into place.
The contrast trick
Some of the most unsettling villains have gentle, ordinary names. A monster called something soft and human is frightening precisely because the name promises safety the character will not deliver. This works best for villains whose horror is intimate, the kindly neighbour, the trusted advisor, the smiling tyrant. If your antagonist hides in plain sight, resist the urge to name them something obviously evil. Let the plain name do the lying.
Make it sayable and memorable
A villain whose name nobody can pronounce is a villain nobody quotes. The most enduring antagonist names are surprisingly easy to say, often two or three syllables, with a clear stress and a shape the ear can hold. If your players or readers have to slow down to sound it out, the menace leaks away. Apostrophes and unpronounceable clusters are a common trap; a single striking name beats a tangle of consonants every time.
Putting it together
Start with the kind of villain and the tradition that fits, generate a batch from the matching tool, and read the results aloud. Shortlist the ones that catch in the mouth, then test each against the character: does it suit a brute or a schemer, a ruler or a recluse? Add a single epithet only if the villain has earned one. The right name will feel a little dangerous to say, and you will know it when you hear it. For the broader craft that underpins all of this, see the pillar guide on how to name a fantasy character.