BAKBUK

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).

From the International Standard Bible Encyclopedia
Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co.