UNNO

un'-o (`unno; the Septuagint omits the name, but in Codex Sinaiticus, a later hand has added Iana; the Qere of the Massoretic Text has `unni, as in 1 Chronicles 15:18, whence the King James Version has "Unni"): A Levite who returned with Zerubbabel (Nehemiah 12:9).

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