How can God (Jesus) have a secret identity? (Protestant view, including Messianic Jewish, if possible)

I love this passage, but especially the part that I have emphasized: > **The Heavenly Warrior Defeats the Beast** 11 I saw heaven standing open > and there before me was a white horse, whose rider is called Faithful > and True. With justice he judges and wages war. 12 His eyes are like > blazing fire, and on his head are many crowns. **He has a name written > on him that no one knows but he himself.** 13 He is dressed in a robe > dipped in blood, and his name is the Word of God. Revelation 19:11-13 > (NIV) So how can God (Jesus) have a secret identity, as indicated in this scripture? Is there support for this, or anything like it, elsewhere in scripture? I am interested in the Protestant answer to this question, especially also the Messianic Jewish answer, if possible. Although a Catholic answer will (probably) not be accepted, I would still appreciate a good answer.