Smith's Bible Dictionary (1863)
(sword). “Children of Besai” were among the Nethinim who returned to Judea with Zerubbabel. (Ezra 2:49; Nehemiah 7:52)
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
BE'SAI (sword, or conqueror), an ancestor to some of the Nethinim. Ezr 2:49: Neh 7:52.
Hitchcock's Bible Names (1869)
a despising; dirty