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The people group and the lanagugae are named either Jek, or Dzhek people (russian дж for J voice) in all English-language sources, e.g. 1, 2, 3, 4, 5, etc. No sources with Jack people could be found. For further moves please submit your proofs. Bests, Ali-al-Bakuvi (talk) 15:25, 8 April 2014 (UTC)