Caractacus Pott is one of the main characters in Ian Fleming's novel Chitty-Chitty-Bang-Bang and its film adaptation. He is an eccentric inventor who lives with his wife and twin eight-year-old children, Jeremy and Jemima, on the Potts' hilltop farm. In the film version he does not have a wife, but he and his children live with Grandpa Pott; the family surname is altered from "Pott" to "Potts".
Caractacus is an inventor who sells a candy invention, Toot Sweets, to candy magnate Lord Scrumptious. He later turns an old racing car (originally named the "Paragon Panther") into the flying, floating motor-car of the title. He is named after a British chieftain who fought against the Romans under the emperor Claudius. The name "Caractacus Pott(s)" is also similar to "crackpot", a derogatory term for someone who is eccentric, particularly a scientist or inventor.
Read more about Caractacus Pott: Caractacus Pott of The Book, Caractacus Potts of The Film