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Family name Siama (Siama , Сяма ) , across the world, is quite a common last name. The surname Siama is habitual in the Democratic Republic of the Congo, where it is quite a rare surname, Cameroon, where it is a rare surname, and Greece. Not in comparison with a country's population, this name is the most popular in the Democratic Republic of the Congo, Indonesia, and Cameroon. Also, Siama is the forename as well as the last name.