Name suggestions with a macabre/gothic theme
Adrienne: Meaning “the dark one”. Can also mean “the one from Hadria”
Umbra/Ombra: Latin name meaning “shade” or “darkness”
Arachne: Arachne was a weaver who was transformed into a spider after challenging the Goddess Athena
Hecate: A Greek goddess associated with witchcraft and the underworld
Kalma: As in the Finnish god of death and decay
Kali: The Hindu goddess of doomsday and death. Can also mean "black" or "dark"
Lilith: Meaning “night monster”. Lilith is a demon in Jewish mythology
Draven: Meaning “of the raven”. Can also mean "crow hunter"
Chaos (can also be spelled Kaos or Khaos): Total disorder, or the Greek idea of total emptiness
Crimson: The color of blood.
Blade: “Sword” or “wealthy glory”; also after the half-vampire main character in the movie “Blade”
Morticia: Meaning “death”, also a character in “The Addams Family”
Rogue: “Unpredictable” or “mischievous”. It can also mean "wanderer"
Onyx: “Claw” or “fingernail”, also a shiny black gem
Vladimir: This name is based on the ruler of Romania who inspired the Dracula story. In Slavic, it means “of great power.”
Thana: With Arabic roots, this name means “death”. Can also mean "praise"
Thanatos: In Greek mythology, Thanatos is a figure who represents death.
Nandor: Vampire character from FX's "What We Do in the Shadows". Originally meaning "brave"
Lucy: Character from Bram Stoker's "Dracula". Originally meaning "light"
Armand: Vampire character from "Interview with the Vampire". Originally meaning "soldier" or "warrior"
Some extra names that don't have a deep meaning:
Cal (short for calcium wich is found in bones, or "calavera" wich is a spanish word for skull)
Letal (spanish word for lethal, pronounced "let-all", you could also use Lethal)