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Family name Kaian (开安 , Kaian , Каян ) , across the world, is quite a rare last name. The surname Kaian is habitual in Armenia, where it is quite a common surname, Papua New Guinea, where it is quite a rare surname, and Belarus. Not in comparison with a country's population, the name is most common in China, Papua New Guinea, and Armenia. Also, Kaian is the forename as well as the last name.