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Surname Jemmett (Jemmett ) , across the world, is a rare cognomen. The last name Jemmett is characteristic of Isle of Man, where it is quite a rare surname, New Zealand, where it is a rare surname, and the United Kingdom. In absolute terms, it is commonest in the United Kingdom, the United States, and Australia. Very seldom, Jemmett is the forename as well as the last name.