From BiblePortal Wikipedia

Ishmaelite [1]

occurs in the A.V. at  Genesis 37:25;  Genesis 37:27-28;  Genesis 29:1, as a general name of the Abrahamic peoples of the " east country"' or BENE-KEDEL (See Bene-Kedel) (q.v.); but elsewhere ( 1 Chronicles 2:17) in the strict sense of the proper Ishmaelites (as Anglicized in  Judges 8:24 :  Psalms 83:6), with which the Heb. name corresponds.