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Surname Janek (Janek , Янек , Жанек ) , in the entire world, is quite a rare last name. The surname Janek is habitual in Eastern Europe, particularly Slovakia, where it is quite a common surname, Czechia, where it is quite a rare surname, and Poland. Not in comparison with a country's population, the name is most common in Poland, Slovakia, and Germany. More frequently, Janek is the forename as well as the last name.