Boyd’s Bible Dictionary:
Ishmaelites
(1 Chron. 5:10-20; 27:31; Psa. 83:6).
Concise Bible Dictionary:
People in Arabia on whom the two and a half tribes made war. The great spoil captured shows that they were a wealthy tribe (1 Chron. 5:10,19-22; Psa. 83:6). The origin of the name, and where they abode, is not known. In the above Psalm they are distinguished from the Ishmaelites.
Jackson’s Dictionary of Scripture Proper Names:
masculine plural of Hagar