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I don't think you have the relationship between Kathleen and Caitlin quite right. I don't know of any evidence that a French form with -line became Kathleen in England independently of the Irish name. Rather, Kathleen is an Anglicized spelling of the Irish name and was imported into England from Ireland, not directly from France. In Gaelic Caitlin is pronounced something like "Cot-leen" and so Kathleen is really closer to the original pronunciation of Caitlin in Ireland than Katelynn would be. :)