ish'-bak (yishbaq):

A name in the list of sons of Abraham by Keturah (Genesis 25:2 parallel 1 Chronicles 1:32). These names probably represent tribes; the tribe of Ishbak has not been certainly identified.

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'ISHBAK'". "International Standard Bible Encyclopedia". 1915.