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Surname Tarn (Tarn , ธาร , Тарн ) , around the world, is quite a rare last name. The family name Tarn is characteristic of Cayman Islands, where it is quite a rare surname, Estonia, and the United Kingdom, where it is a rare surname. In absolute terms, it is commonest in the United Kingdom, the United States, and Malaysia. Also, Tarn is the forename as well as the last name.