Smith's Bible Dictionary (1863)
(whom Jehovah makes joyful), a chieftain of Manasseh on the east of Jordan.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
JAH'DIEL (whom God makes joyful), the head of a family in the trans-Jordanic half-tribe of Manasseh. 1 Chr 5:24.
Hitchcock's Bible Names (1869)
the unity, or sharpness, or revenge, of God