Ismaiah
From BiblePortal Wikipedia
Fausset's Bible Dictionary [1]
A Gibeonite chief of the men who left Saul, the head of their tribe, to join David at Ziklag ( 1 Chronicles 12:1-4); "a mighty man among the 30 and over the 30."
Morrish Bible Dictionary [2]
A Gibeonite, the head of David's thirty valiant men: he joined David at Ziklag. 1 Chronicles 12:4 .