🔼The name Mara in the Bible
The name Mara occurs only once in the Bible. It's the name that Naomi gives herself after returning to Bethlehem from Moab, where her husband Elkanah and two sons Mahlon and Chilion have died (Ruth 1:20). Chilion's widow Orpah stayed behind but Mahlon's widow comes with Naomi. In Bethlehem she meets and marries Boaz, and they become the parents of Obed, the grandparents of Jesse, the father of king David.
🔼Etymology of the name Mara
Naomi says, "Call me Mara because Shaddai has dealt bitterly with me" (Ruth 1:20), and the word for bitter comes from the verb מרר (marar), meaning to be bitter:
When Naomi calls herself Mara, she is not simply complaining that she's been dealt a lousy hand; she's saying that the grief that Shaddai has visited upon her has made her strong.
For a meaning of the name Mara, Jones' Dictionary of Old Testament Proper Names reads Bitterness. NOBSE Study Bible Name List has Bitter.