Lennon is an Irish surname from Ó Leannáin, derived from leannán and meaning "lover" or "sweetheart". For almost everyone it is first the name of John Lennon of the Beatles, which gives it a creative, peace-and-love spirit that parents of both boys and girls like. Lennon entered the US top 1000 for girls in 2013 and has risen from number 518 in 2015 to number 214 in 2025, its highest rank to date.