Rose DeWitt-Bukater is a fictional character created for the movie "Titanic" by James Cameron. Many people believe the character was based on a passenger from the ship, but this is not true. Some characters from the movie were based on real passengers or crew, but Rose was not.
Rose's lover, Jack Dawson, was also a fictional character. However, one victim of the Titanic, a crew member, did share the same last name, but his first name was Joseph. Joseph Dawson is buried in Halifax, Nova Scotia, and his grave is marked J. Dawson. This has led many to visit the grave and immortalize him as the fabled Jack Dawson from the movie.