Writing in Revelation often has the significance of divine revelation.
Name in the NT signifies your whole person: everything you are and everything you stand for.
In Matt. 11.27 a similar statement pertains to Jesus’s identity as the Son of God, authorized to represent God and do His bidding. Using terms of knowledge, the idea of the text is that the Father has elected the Son to be His full revelation on Earth (Heb. 1.2), and the Son has acknowledged the Father before humankind (John 14.7-11). It's the role of the Son to represent God in the world and to bring people to a knowledge of Him. Jesus is talking about his authority, position, and role. The Son is the one with the knowledge, the power, and the will to reveal the Father to humankind.
With the incarnation of Christ, God is coming out of the shadows of concealment, so to speak, revealing Himself in the person of Jesus and ushering in the promised time of salvation. The content of the revelation isn't a teaching but a person. Because of Jesus we can know God (John 17.25-26), for the Son is the One who knows God with full knowledge.
It speaks of the identity, authority, and position of Christ. Jesus in his nature is the revelation of God himself (cf. 1 Cor. 15.24; Rev. 12.10). The point of the text is not knowledge, but rather world dominion.
Craig Keener writes,
"That his name is unknown may simply be a way of saying that no one has power over him (ancient magicians claimed that they could coerce spirits once they knew their names)."
Since the image of "eyes of blazing fire" at the beginning of the verse are those of holiness, righteousness, and judicial privilege, and since the many crowns in his head speaks of absolute authority, "the name that no one knows" plausibly also refers to world dominion.
