Shelley \sh(el)-ley\ as a girl's name (also used as boy's name Shelley), is pronounced SHEL-ee. It is of Old English origin, and the meaning of Shelley is "sloped meadow". Place name. Used as a short form of names like Michelle, Rochelle, and Shirley. Made famous by poet Percy Bysshe Shelley. Actresses Shelley Long, Shelley Duvall, Shelley Winters.