Clancy, one of the original crossover Irish surname names, is as energetic and appealing as ever — full of moxie, more distinctive than Casey, and also one of the less obvious of the red-headed names.

A literary namesake is Clancy Sigel, author of the autobiographical novel Going Away, and there is also the comical mid-century song, Clancy Lowered the Boom.

More common as a last name than a first, Clancy has gained fame via the Irish folk music group the Clancy Brothers, and one of the bestselling authors of all time, Tom Clancy, known for his espionage and techno thrillers.