mattaniah

from Easton's 1897 Bible Dictionary
Mattaniah
gift of Jehovah. (1.) A Levite, son of Heman, the chief of the
ninth class of temple singers (1 Chr. 25:4, 16).

  (2.) A Levite who assisted in purifying the temple at the
reformation under Hezekiah (2 Chr. 29:13).

  (3.) The original name of Zedekiah (q.v.), the last of the
kings of Judah (2 Kings 24:17). He was the third son of Josiah,
who fell at Megiddo. He succeeded his nephew Jehoiakin.
    
from Hitchcock's Bible Names Dictionary (late 1800's)
Mattaniah, gift, or hope, of the Lord
    

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