Concise Bible Dictionary:
Designation of Ira and Gareb, two of David’s mighty men, described as among “the families of Kirjath-jearim,” which links them with Judah (2 Sam. 23:38; 1 Chron. 2:53; 1 Chron. 11:40).
Potts’ Bible Proper Names:
Excelling; remaining:―descendant of Jether; native of Jattir, 2 Sam. 23:38. {Excellens}