Overview
Dick is a nickname most often for Richard, which likely originated in the Middle Ages as rhyming slang for "Rick", as did William → Will → Bill and Robert → Rob → Bob. The association with "penis" is more recent, arising from Dick becoming a cliché name for any man, as in Tom, Dick and Harry.
Notable people
Dick Lee (disambiguation), multiple people
Business
Richard S. Fuld Jr. (born 1946), American banker best known as the final chairman and chief executive officer of Lehman Brothers
Dick Graves (1912–1990), American casino owner
Dick Smith (entrepreneur), Australian businessman
Dick Teague (1923–1991), American industrial designer
Crime
Richard Hickock (1931—1965), one of the murderers of the Clutter family, the subject of the book and film "In Cold Blood"
Dick Turpin (1705–1739), English highwayman executed for horse theft
From Wikipedia (CC BY-SA 4.0).