Kaylin is a modern name created based on names like Katelyn and Kayla. In some cases it may represent a phonetic English pronunciation of the Irish cailín which is the vobulary word for "girl" (see Colleen). Some may see it as a form of the Irish name Caoilfhionn, but this is probably more after-the-fact matching than an actual origin.
See Also: Colleen, Caoilfhionn, Calen, Caillan, Caelan, Cailin, Cailyn, Caelyn, Cailynn, Kaelin (boy), Kaelin, Kaylyn, Kaylynn

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