Kailan is a unisex given name with roots in the Irish Gaelic Caolán—derived from caol, meaning “slender” or “narrow”—that has been embraced in Anglo-American naming for its clean, adaptable sound. Pronounced KAY-lin (/ˈkeɪlɪn/), it conveys a subtle elegance while remaining approachable across genders. First appearing in U.S. Social Security Administration records in the early 1990s, Kailan has maintained a modest yet steady presence on the naming charts, typically ranking in the 800s; in 2024, forty-four newborns were named Kailan, placing it at number 880. Its gradual, understated rise reflects a growing preference for names that honor traditional etymology without sacrificing modern versatility.