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Family name Pirn (ปิน , Pirn , Birne ) , in the entire world, is a rare surname. The surname Pirn is habitual in Estonia, where it is quite a common surname, Latvia, where it is a rare surname, and Portugal. Measured by absolute frequency, the name is most common in Estonia, the United States, and Brazil. More prevalently, Pirn is the forename as well as the last name.