What is the name of the victim in Murder on the Orient Express? The answer is Ratchett.
Ratchett is the name used by the American businessman travelling aboard the train, but it is an alias. Hercule Poirot discovers that the murdered man is actually Cassetti, the kidnapper and killer responsible for the death of the child Daisy Armstrong.
Cassetti escaped legal punishment through corruption and technicalities, then fled and adopted the identity of Ratchett. He receives death threats on the train and asks Poirot for protection, but Poirot refuses because he immediately dislikes him. Soon afterward, Ratchett is found dead in his compartment.
The alias explains why both “Ratchett” and “Cassetti” may appear in summaries of the mystery. The other listed names are passengers or investigators: Princess Dragomiroff is a passenger, Mrs. Hubbard is another passenger, and M. Bouc helps Poirot investigate. For a quiz asking for the name used in the story, Ratchett is the expected answer.