What is the name of the servant executed for William's murder in the novel?

Justine Moritz is the servant executed for William Frankenstein’s murder in Mary Shelley’s novel.

Justine is a young woman who has been welcomed into the Frankenstein household and is treated as part of the family. After William, Victor’s youngest brother, is strangled by the creature, suspicion falls on Justine because William’s portrait locket is found among her belongings.

Justine is innocent, but the circumstantial evidence persuades the authorities to prosecute her. She is pressured into making a false confession and is convicted, despite Victor’s private certainty that the creature committed the crime. Justine is then executed, becoming one of the novel’s clearest examples of injustice caused by fear, appearances, and institutional failure.

Margaret Saville is Walton’s sister and the recipient of his letters. Caroline Beaufort is Victor’s mother, while Elizabeth Lavenza is Victor’s adopted cousin and later his wife. None of those characters is executed for William’s murder.