Both the name and its explanation, "a half shekel," are given in Exodus 38:26 . The word properly means a "division," a "part." (RSV, "beka.")
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.
[N] indicates this entry was also found in Nave's Topical Bible
[H] indicates this entry was also found in Hitchcock's Bible Names
[S] indicates this entry was also found in Smith's Bible Dictionary
Bibliography InformationEaston, Matthew George. "Entry for Bekah". "Easton's Bible Dictionary".