When Tobias asked the angel where he was from, he said: "I am Azarias, the son of the great Ananias." Azarias means "the Lord is my helper," Ananias means "grace of the Lord." And the Lord intimates to those who believe in him that he is the one whom the prophet, desiring his coming, sang: "Be my helper and my deliverer, O Lord, do not delay" (Psalm LXIX). Of whom also the evangelist says: "And we saw his glory, the glory as of the only begotten from the Father, full of grace and truth" (John I).
Source: Commentary on Tobit