AddoADDO. KJV, ASV form of Iddo (1 Esd 6:1). International Standard Bible Encyclopedia (1915) (Codex Alexandrinus, Addo; Codex Vaticanus, Eddein) = Iddo (Ezr 5:1; 6:14): The father (Zec 1:1,7 grandfather) of Zechariah the prophet (1 Esdras 6:1).