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Cognomen Innis (Innis , Inch , איניס ) , in all the world, is quite a common surname. The cognomen Innis is characteristic of Jamaica, where it is quite a common surname, Isle of Man, where it is quite a rare surname, and Barbados. In absolute terms, the name is most common in the United States, the United Kingdom, and Canada. Much less frequently, Innis is the forename as well as the last name.