116. There is some question as to the origin of this name. It is often assumed that Fat Man is a code meaning Winston Churchill, and Little Boy refers to Franklin Roosevelt. I don’t think this is the case. Serber seems to have based the name Fat Man on Sydney Greenstreet’s character in the 1941 movie, The Maltese Falcon. This was the third motion-picture version of Dashiell Hammett’s novel from 1930, and the naming is in keeping with Serber’s interest in movies based on Hammett novels.