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Cognomen Cilek (Cilek ) , all over the world, is a rare family name. The surname Cilek is characteristic of Bosnia and Herzegovina, where it is quite a rare surname, Czechia, and Slovakia, where it is a rare surname. Not in comparison with a country's population, the name is most common in the United States, Czechia, and Indonesia. Very seldom, Cilek is the forename as well as the last name.