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Cognomen Jein (Jein , ジーン , ג'יין ) , across the world, is quite a rare surname. The family name Jein is characteristic of Denmark, where it is quite a rare surname, Estonia, and Malaysia, where it is a rare surname. In absolute terms, the name is most common in Indonesia, Myanmar, and Denmark. More prevalently, Jein is the forename as well as the last name.