Easton's Bible Dictionary (1897)
Bitter; sad, a symbolical name which Naomi gave to herself because of her misfortunes (Ruth 1:20).
Smith's Bible Dictionary (1863)
(sad, bitter), the name which Naomi adopted in the exclamation forced from her by the recognition of her fellow citizens at Bethlehem. (Ruth 1:20)
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
MA'RA (bitter). Ruth 1:20. See Naomi.
Hitchcock's Bible Names (1869)
Marah, bitter; bitterness