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Family name Platt (Plat , Platt , بلات, and others...) , all around the world, is a common last name. The last name Platt is habitual in Namibia, where it is quite a common surname, Guernsey, and Isle of Man (explore the name in all countries). Not in comparison with a country's population, the name is most common in the United States, the United Kingdom, and Australia. Much less frequently, Platt is the forename as well as the last name.