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Surname Siana (Siana , Сиана ) , in the entire world, is quite a rare last name. The cognomen Siana is characteristic of Guatemala, where it is quite a rare surname, North Macedonia, where it is a rare surname, and Greece. Measured by absolute frequency, this name is the most popular in Indonesia, Guatemala, and the United States. Also, Siana is the forename as well as the last name.