The name Hadley comes from a surname, which is derived from a place name meaning "heather field" in Old English.
Famous bearers
A bearer is Elizabeth Hadley Richardson (1891 - 1979), the first wife of Ernest Hemingway.
Bearers of the surname include George Hadley (1685 - 1768), an English lawyer and amateur meteorologist;
Patrick Hadley (1899 - 1973), an English composer.