Ishbak

Easton's Bible Dictionary (1897)

Leaving, one of Abraham’s sons by Keturah (Gen. 25:2).

Smith's Bible Dictionary (1863)

(left behind), a son of Abraham and Keturah, (Genesis 25:2; 1 Chronicles 1:32) and the progenitor of a tribe of northern Arabia. (B.C. after 1856.)

Hitchcock's Bible Names Dictionary (1869)

who is empty or exhausted

Public domain dictionaries.