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Last name Sladek (Sladek , Сладек ) , around the globe, is quite a common cognomen. The family name Sladek is habitual in Czechia, where it is quite a common surname, Slovakia, and Austria, where it is quite a rare surname. In absolute terms, this name is the most popular in Czechia, the United States, and Germany. Much less frequently, Sladek is the forename as well as the last name.