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Family name Janosik (Janosik ) , around the globe, is quite a rare last name. The last name Janosik is habitual in Eastern Europe, particularly Slovakia, where it is quite a common surname, Czechia, where it is quite a rare surname, and Hungary. Measured by absolute frequency, the name is most common in Slovakia, Czechia, and the United States. Much less frequently, Janosik is the forename as well as the last name.