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Last name Siem (Siem , Сим , סיאם ) , around the globe, is a common surname. The last name Siem is habitual in South Korea, where it is a common surname, Cayman Islands, where it is quite a common surname, and Norway, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in South Korea, Russia, and Indonesia. Much less frequently, Siem is the forename as well as the last name.