UNNI (ŭn'ī, Heb. ‘unnî, meaning unknown)

One of the Levites whom David appointed to play in connection with the tabernacle service (1Chr.15.18, 1Chr.15.20).Another Levite employed in the music service of the temple following the Captivity (Neh.12.9). “Unno” is the corrected spelling.

UNNI un’ ī (עֻנִּ֡י). A Levite musician in David’s time who accompanied the Ark of the covenant when it was brought to Jerusalem (1 Chron 15:18-20).

2. A family of Levites that returned from the Captivity with Zerubbabel (Neh 12:9; KJV UNNI; ASV, RSV UNNO).

International Standard Bible Encyclopedia (1915)

(1) One of "the twelve brethren" (so Curtis for the Revised Version (British and American) "brethren of the second degree") appointed as singers (1Ch 15:18,20).

(2) In Ne 12:9 (Kethibh `unno) = the Revised Version (British and American) UNNO (which see).