Hadley \ha(d)-ley\ as a girl's name (also used as boy's name Hadley), is pronounced HAD-lee. It is of Old English origin, and the meaning of Hadley is "heather meadow". Name of Ernest Hemingway's first wife. Hadley has 8 variant forms: Hadlea, Hadleigh, Hadly, Hedlea, Hedleigh, Hedley, Hedlie and Hedly. A baby name that sounds like Hadley is Hedyla.