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Surname Siani (Siani , سياني , סיאני ) , across the world, is quite a common family name. The family name Siani is characteristic of Cameroon, where it is quite a common surname, Israel, where it is quite a rare surname, and Paraguay. Not in comparison with a country's population, it is commonest in Cameroon, Italy, and Israel. Much less frequently, Siani is the forename as well as the last name.