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Family name Hajn (Hajn , Гайн , Хайн ) , in all the world, is quite a rare cognomen. The surname Hajn is characteristic of Czechia, where it is quite a rare surname, Kazakhstan, where it is a rare surname, and Poland. In absolute terms, this name is the most popular in Czechia, Russia, and Kazakhstan. Much less frequently, Hajn is the forename as well as the last name.