Reference: Ishbak
Fausets
("leaving behind".) Son of Abraham and Keturah (Ge 25:2; 1Ch 1:32). From him sprang the N. Arabians. There is a valley "Sabak" related to the name. The Keturahites extended from the borders of Palestine to the Persian gulf. Ishbak, as his name implies, left behind his brethren, having gone forth first. His dwelling was probably far away toward the Persian gulf, and also reaching into the peninsula.
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Hastings
A son of Abraham by Keturah (Ge 25:2 = 1Ch 1:32). The tribe of which he is the eponym is somewhat uncertain.
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Morish
Ish'bak
Son of Abraham and Keturah. Abraham gave him gifts, and sent him away from Isaac unto the east country. Ge 25:2,6; 1Ch 1:32. An Assyrian inscription mentions "Bur-anate of the land of Iasbuk " (IA-AS-BU-QA-AI) which is judged to refer to the above, situate on the west bank of the Euphrates.
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Smith
Ish'bak
(left behind), a son of Abraham and Keturah,
and the progenitor of a tribe of northern Arabia. (B.C. after 1856.)