Meaning: Its source is Caolan, an Irish Gaelic name meaning "Slim."

Origin: "Caolan."

Alternative Spellings: Kaelan and Kellan

Variant Forms: Kellen

Source Forms: Caolan

Meaning: Its source is Caoilinn, a Gaelic name meaning "Slim and fair."

Origin: "Caoilinn."

Alternative Spellings: Kaylen and Kellan

Variant Forms: Kaelen, Kaelin, Kaelynn, Kailen, Kailin, Kailyn, Kailynn, Kaylan, Kelin, Kellen and Kellin