Mom's Irish. I have a cousin Ferlin. I always understood the suffix "lin" or "leen" to mean "light". Kath-leen = pure light, Fer-lin= bearer of light, etc.
― Anonymous User 7/16/2014
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Um, it does NOT mean "country girl." That is inaccurate.
My name is Cailin. It is actually not a name, but a word. It is the word "girl" in Gaelic and is pronounced "Colleen". For example "cailin rua" is the "red-haired girl" and "cailin dubh" is the "dark-haired girl". There is actually an accent over the second 'i' (called a "fada" in Irish.) [noted -ed]