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Last name Kairys (Kairys , Кайрис , Кайрыс ) , throughout the world, is quite a rare surname. The family name Kairys is characteristic of Lithuania, where it is quite a common surname, Belarus, where it is quite a rare surname, and Ireland, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Lithuania, the United States, and Russia. Much less frequently, Kairys is the forename as well as the last name.