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Last name Janusek (Janusek ) , throughout the world, is a rare cognomen. The cognomen Janusek is habitual in Eastern Europe, particularly Slovakia, where it is quite a rare surname, Czechia, where it is a rare surname, and Poland. Not in comparison with a country's population, the name is most common in Poland, Slovakia, and the United States. Likewise, Janusek is the forename as well as the last name.