The name "Lennon" is of Irish origin and is derived from the Irish surname Ó Leannáin or Mac Leannáin. It is an anglicized version of the Gaelic name "Ó Leannáin," which means "descendant of Leannán." The Gaelic word "leannán" originally referred to a lover or sweetheart. In Irish folklore, a leannán sídhe (fairy lover) was a beautiful muse who provided artistic inspiration and creative talent to poets and artists. Over time, the meaning of the name "Lennon" has evolved and is now primarily used as a surname or a given name.