Well, for an evil name in a story, how about 'Nightmare Incarnate', 'Corrupted Heart', or 'Demonic Shade'? They all give off that sinister and evil vibe.
You could consider names like 'The Dark Lord', 'Malice Master', or 'Sinister Soul'.
Some evil names could be 'Shadow of Doom', 'Venomous Fiend', or 'Malevolent Mistress'. These names convey a sense of darkness and malevolence.
Some possible names could be 'The Dark Covenant', 'The Shadow Syndicate' or 'The Malevolent Order'.
How about 'The Nightmare Collective'? It gives the feeling that they are the source of nightmares. Or 'The Death's Grasp Society', which sounds really spooky. Another name could be 'The Macabre Mafia'.
Raven. Ravens are often associated with death and darkness in many cultures. Using it as a name can bring an air of mystery and evil to a story. For example, a character named Raven could be a brooding villain who lurks in the shadows.
Morgoth. It is a name from Tolkien's legendarium, representing a great and evil power.
Lilith. In many mythologies, Lilith is seen as a dark and somewhat malevolent figure, so it would be a great evil name for a story.
In " Phoenix Baths in Fire," the legendary evil and domineering male lead wore a silver mask that was his symbol. His name was never revealed.
There are several names that might work well. 'Avery' is a unisex name but can be very feminine for a girl's private story. It has a strong and confident feel. 'Sadie' is a cute and spunky name. 'Ruby' is also a great choice as it is associated with the precious gemstone and can imply something special in the context of a private story.
How about 'The Snap End'? It's like a snap of the fingers, quick and unexpected. 'The Brusque Conclusion' is another option. The word 'brusque' means abrupt or curt, which is perfect for a sudden ending. And 'The Sudden Wrap - up' is a simple and direct name.
You could consider 'Dagger'. It's a simple name but it clearly implies a weapon that can be used for killing. 'Obsidian' is also a good choice. Obsidian is a dark, sharp - edged stone, which can represent the killer's cold and cutting nature. 'Fang' can be used to show the killer's sharp and dangerous side, like the fangs of a predator.
Ella. It's a short and sweet name that gives the impression of an innocent and lovely girl. The simplicity of the name makes it easy to remember and suits well for a story character.