Kaelin is a unisex given name of Scottish origin, derived from the place name "Caillean" which means "slender". It gained popularity as a first name in the United States during the late 20th century, particularly after being used by celebrities such as actress Kaley Cuoco and model Kaia Gerber. The name is often associated with strength, creativity, and individuality, reflecting its unique sound and spelling.
The name Kaelin peaked in popularity around the mid-1990s with a significant jump to 63 births in 1994 and reaching its highest point at 121 births in 1995. Since then, it has seen a steady decline, with only 6 births recorded in 2023.