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Surname 잠 (Djam , 잠) , around the globe, is quite a rare family name. The family name 잠 is characteristic of Cameroon, where it is quite a rare surname, Algeria, and Ghana, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Cameroon, Algeria, and Indonesia. Likewise, 잠 is the forename as well as the last name.