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Family name Jonca (Йонка , Jonca ) , in the entire world, is quite a rare cognomen. The family name Jonca is habitual in Bulgaria, where it is quite a common surname, Poland, where it is quite a rare surname, and Lithuania, where it is a rare surname. Measured by absolute frequency, the name is most common in Bulgaria, Poland, and France. Likewise, Jonca is the forename as well as the last name.