Shirlean is a unique and distinct given name of American origin. It is derived from the Irish surname O'Sullivan, which means 'descendant of Sulliwan'. The name has been adopted as a feminine given name in some regions, particularly in the United States.
The name Shirlean experienced significant popularity during the 1940s and 1950s, with peaks in births occurring in 1940 (12), 1945 (13), 1948 (13), 1949 (18), and 1956 (17). However, its usage declined steadily from the late 1950s onwards, with fewer than 10 births annually between 1962 and 1971, inclusive.