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Cognomen Kett (Kett , Кет , ケット) , in the entire world, is quite a rare surname. The family name Kett is characteristic of Ireland, where it is quite a rare surname, Germany, and the United Kingdom, where it is a rare surname. In absolute terms, the name is most common in Germany, the United Kingdom, and the United States. Much less frequently, Kett is the forename as well as the last name.