In "Adventures of Huckleberry Finn," Huck's father is Pap Finn.
Pap is an abusive, alcoholic drifter who returns to claim control of Huck after Huck has been taken in by the Widow Douglas and Miss Watson. He is less interested in parenting than in seizing Huck's money, which Huck received after the events of "The Adventures of Tom Sawyer." Pap resents education and civilized life, and he becomes violent when Huck resists him.
Pap locks Huck in a remote cabin, prompting Huck to fake his own murder and escape. This deception begins Huck's journey down the Mississippi River with Jim. Later, Jim discovers a dead man in a floating house and prevents Huck from seeing the body; near the novel's end, Jim reveals that the dead man was Pap. The revelation frees Huck from the threat of being recaptured by his father.
Pap is not given a conventional first name in the novel. "Pap" is the familiar term Huck uses for him, and quiz answers generally treat "Pap" or "Pap Finn" as the canonical response.