Ebyathar means "my father is great" or "father of abundance." It is the name of the High Priest who served during the reign of David, the son of Ahimelech of Nob.
Abiathar was one of David's most loyal companions, escaping the massacre at Nob after Saul killed the priestly community (1 Samuel 22). He served faithfully throughout David's reign. However, he sided with Adonijah in the succession dispute, leading Solomon to remove him from the priesthood — fulfilling the prophecy against the house of Eli (1 Kings 2:27). The name reminds us that human loyalty must be ultimately oriented toward God's purposes.