Cats are believed to have been brought first into England from Cyprus by merchants who came to Cornwall for tin. It is generally supposed that the name is Teutonic. If so, it is a curious coincidence that the modern Persian name for cat is catio.
-- from Words, facts, and phrases; a dictionary of curious, quaint, and out-of-the-way matters, Eliezer Edwards (Chatto & Windus, 1882), p. 104. I have been trying to find any other reference to this theory, which is totally new to me. So far, nothing. Anyone else ever heard this one?