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Last name Swai (ไสว , Swai , สไว ) , in the entire world, is a common family name. The family name Swai is characteristic of Tanzania, where it is quite a common surname, Kenya, where it is quite a rare surname, and United Arab Emirates, where it is a rare surname. Not in comparison with a country's population, the name is most common in Tanzania, India, and Kenya. Also, Swai is the forename as well as the last name.