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Surname Inis (Ennis , Inis , Инис ) , worldwide, is a common family name. The cognomen Inis is characteristic of Ireland, where it is quite a common surname, Jamaica, and the United States, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in the United States, Ireland, and the United Kingdom. Much less frequently, Inis is the forename as well as the last name.