Mara
The name Mara means “Marah, bitter; bitterness”.
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)
International Standard Bible Encyclopedia 1915
ma'-ra, mar'-a (marah, "bitter"): The term which Naomi applies to herself on her return from Moab to her native country (Ru 1:20). Changed beyond recognition, she creates astonishment among her former acquaintances, who ask, "Is this Naomi?" She replies, "Call me not Naomi" (i.e. "pleasant" or "sweet"), but "call me Mara" (i.e. "bitter"). In the light of her bitter experience, and her present pitiable plight, the old name has become peculiarly inappropriate.