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Last name Czaja (Czaja ) , worldwide, is a common cognomen. The cognomen Czaja is habitual in Poland, where it is quite a common surname, Germany, where it is quite a rare surname, and Denmark, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Poland, Germany, and the United States. Also, Czaja is the forename as well as the last name.