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Family name Siala (Siala ) , globally, is quite a rare last name. The family name Siala is habitual in Tunisia, where it is quite a common surname, Libya, where it is quite a rare surname, and Lebanon. Not in comparison with a country's population, this name is the most popular in Tunisia, Indonesia, and the Democratic Republic of the Congo. Much less frequently, Siala is the forename as well as the last name.