Jesus has manifested the Father's name to his disciples.

John 17:6, 26

⁶I have manifested thy name unto the men which thou gavest me out of the world: thine they were, and thou gavest them me; and they have kept thy word.

²⁶And I have declared unto them thy name, and will declare it: that the love wherewith thou hast loved me may be in them, and I in them.