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Family name Barnett (Barnett , ברנט , Барнетт ) , around the globe, is a widespread last name. The family name Barnett is habitual in Jamaica, where it is a common surname, Barbados, where it is quite a common surname, and Jersey (explore the name in all countries). Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Australia. Much less frequently, Barnett is the forename as well as the last name.