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Surname Sigai (Sigai , Сигай ) , in the entire world, is a rare family name. The last name Sigai is habitual in Belarus, where it is quite a rare surname, Latvia, where it is a rare surname, and Malaysia. Not in comparison with a country's population, the name is most common in Russia, Belarus, and Malaysia. Very seldom, Sigai is the forename as well as the last name.