Easton's Bible Dictionary (1897)
Runner; wild ass, one of the antediluvian patriarchs, the father of Mehujael (Gen. 4:18), and grandson of Cain.
Smith's Bible Dictionary (1863)
(fleet), son of Enoch; grandson of Cain, and father of Mehujael.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
I'RAD (fleet), a grandson of Cain. Gen 4:18.
Hitchcock's Bible Names (1869)
wild ass; heap of empire; dragon