Jetur no doubt gave his name to the important tribe of the Ituraeans who inhabited the region southwest of the Damascene plain, between Gaulonitis (Jaulan) and the Ledjah. This tribe was noted for its thievish habits, and was regarded as savage and warlike.

They made war with the Hagarites - This is probably the same war that is mentioned 1-Chronicles 5:10. Those called Hagarites in the text are everywhere denominated by the Targum הונגראיי Hongaraai, Hongarites.

And they made war with the Hagarites, with (g) Jetur, and Nephish, and Nodab.
(g) These twelve were the sons of Ishmael, (Genesis 25:15).

And they made war with the Hagarites,.... Before mentioned, 1-Chronicles 5:19.
with Jetur, and Nephish: with the posterity of these men, who were sons of Ishmael, Genesis 25:15 and so was Nodab; perhaps the same with Kedemah, mentioned along with the other two there; so Hillerus (z) thinks.
(z) Onomastic. Sacr. p. 554.

"They made was with the Hagarites and Jethur, Nephish and Nodab." So early as the time of Saul the Reubenites had victoriously made war upon the Hagarites (see 1-Chronicles 5:10); but the war here mentioned was certainly at a later time, and has no further connection with that in 1-Chronicles 5:10 except that both arose from similar causes. The time of the second is not given, and all we know from 1-Chronicles 5:22 is that it had broken out before the trans-Jordanic Israelites were led captive by the Assyrians. הגריאים, in Psalm 83:7 contracted into הגרים, are the Ἀγραῖοι, whom Strabo, xvi. p. 767, introduces, on the authority of Eratosthenes, as leading a nomadic life in the great Arabico-Syrian desert, along with the Nabataeans and Chaulotaeans. Jetur, from whom the Itureans are descended, and Nephish, are Ishmaelites; cf. on Genesis 25:15. Nodab, mentioned only here, is a Bedouin tribe of whom nothing more is known.