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Surname Sivi (Sivi ) , in all the world, is quite a rare cognomen. The surname Sivi is habitual in Angola, where it is quite a rare surname, the Democratic Republic of the Congo, and Hungary, where it is a rare surname. Measured by absolute frequency, it is the most numerous in the Democratic Republic of the Congo, India, and Angola. More prevalently, Sivi is the forename as well as the last name.