Smith's Bible Dictionary (1863)
(whom Jehovah keeps), a Benjamite, one of the family of Elpaal.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
ISH'MERAI (whom Jehovah keeps), a Benjamite. 1 Chr 8:18.
Hitchcock's Bible Names (1869)
keeper, or keeping