bak'-buk baqbuq, "bottle" perhaps onomatopoetical, referring to the clucking noise created by the pouring out of the contents of a bottle = Acub, (1 Esdras 5:31):

The descendants of Bakbuk returned with Zerubbabel to Jerusalem (Ezra 2:51; Nehemiah 7:53).

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'BAKBUK'". "International Standard Bible Encyclopedia". 1915.