From Monarchists.Wiki

Orpah (Hebrew: עָרְפָּה) was the wife and widow of Chilion.

Orpah was a Moabite, and the Israelite couple Elimelech and Naomi moved to Moab and lived among them. Elimelech's and Naomi's son Chilion married Orpah, while Elimelech's and Naomi's other son Mahlon married Ruth. Elimelech and then Chilion and Mahlon died, leaving Naomi, Orpah, and Ruth as widows.

Naomi learned that God had blessed Judah with more food and decided to return to Judah. Ruth and Orpah began to follow Naomi, but Naomi told them to remain in their homeland and their mothers and asked God to bless them. However, they insisted on going with her. Naomi then explained that she did not have anything more to provide them with and that they were better off remaining in Moab.

Orpah decided to take Naomi's advice and kissed her good-bye. Ruth, however, remained adamant; she was going to remain with Naomi no matter what. Naomi understood Ruth's loyalty and determination and allowed her to follow her to Judah.