It’s very possible to be anointed by God and yet unknown by men. After David took the head off of Goliath’s shoulders with his own sword, King Saul was curious as to who David was.
1 Samuel 17:55-56 “When Saul saw David going out against the Philistine, he said to Abner, the commander of the army, “Abner, whose son [is] this youth?” And Abner said, “As your soul lives, O king, I do not know.” 56 So the king said, “Inquire whose son this young man [is.]”
From reading I Samuel 16, it appears that King Saul must have known David to some degree since he had been summoned to play the harp to sooth Saul when he was distressed. Even prior to David going down into the valley to take on Goliath, David and Saul had a serious conversation. But it is possible to know someone, but really not know them at all. The anointed of God was among Israel, yet not even the king seemed to know who David was. Likewise, there are many men and women who have been anointed by God through salvation and the filling of the Holy Spirit, who are unknown to most people. The Pharisees claimed to know Jesus, but they didn’t really know Him. They said, “Is not this Jesus, the son of Joseph, whose father and mother we know? How is it then He says, “I have come down from heaven?” John 6:42
David was anointed by God, but not so he could be known, but that he could deliver Israel from Goliath and be seated on the throne of Israel. David was Saul’s replacement and Saul didn’t know it. Think about how desperate King Saul and Israel was in that battle. King Saul would allow someone who was unknown to go against Goliath. David was the only volunteer among Israel’s army and he was unknown. As anointed children of God, we should not concern ourselves with being known to men. Even John the Baptist identified himself as “a voice crying out in the wilderness.” Our concern should be to faithfully trust and obey in doing the will of the Father.
Jesus was known not because of His name or by who His earthly father and mother were, He was known by His anointing. He healed the sick, gave sight to the blind, made the lame to walk again, and raised the dead back to life. He was identified by His anointing. David walked in his anointing that caused him to trust in God and to boldly stand against Goliath. As a child of God, you have an anointing on your life. Walk in it!