Hanun = "gracious"

 1) son of Nahash and king of Ammon who dishonoured David's ambassadors
    and lost the subsequent war with David
 2) a man who, with the people of Zanoah, repaired the ravine gate in
    the wall of Jerusalem
 3) the 6th son of Zalaph, who also assisted in the repair of the wall
    of Jerusalem, apparently on the east side