Ishbak
The name Ishbak means “who is empty or exhausted”.
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.)