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Last name Siah (Siah ) , all around the world, is a common cognomen. The cognomen Siah is habitual in South-eastern Asia, particularly Malaysia, where it is quite a common surname, Singapore, and Brunei, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in South-eastern Asia, particularly Malaysia, Indonesia, and Singapore. Also, Siah is the forename as well as the last name.