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Surname Siwi (Siwi , ซิว ) , all over the world, is a common family name. The cognomen Siwi is characteristic of Papua New Guinea, where it is quite a rare surname, Indonesia, and Singapore, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Indonesia, Papua New Guinea, and Ethiopia. Likewise, Siwi is the forename as well as the last name.