Gayleen is a unique and distinctive female given name of American origin. It combines the elements "Gaye," which means "happy" or "rejoice," and "-leen," a suffix of Irish descent that often signifies "little." Therefore, Gayleen can be interpreted as meaning "little joy" or "little happy one." The name first gained popularity in the United States during the mid-20th century. It is not particularly common but is recognized for its unique sound and spelling.
The name Gayleen peaked in popularity between the mid-1940s to early 1960s with notable spikes in 1942 and 1943 (10 births each), followed by a gradual decline throughout the late 1960s until it became quite rare post-1975.