Cailin is just girl in Irish, I don't think it's a name from a Myth...
Also, isn't it pronouced Cohl-EEN
Caroline :-)
"There is no combination of words I could put on the back of a postcard, And no song that I could sing but I can try for your heart. And our dreams, they are made out of real things
Like a shoebox and photographs with sepia-toned loving."