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Cognomen סיאם (Syam , Siam , Siem ) , around the globe, is a widespread last name. The surname סיאם is habitual in Cayman Islands, where it is quite a common surname, Indonesia, and Malaysia (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Indonesia, Bangladesh, and Egypt. Likewise, סיאם is the forename as well as the last name.