The NEW NAME was announcement began in the O.T. (Isaiah) and is NOT JEHOVAH, it is "I am who I am".
Isa 62:2 The nations shall see your vindication, and all the kings your glory; and you shall be called by a new name which the mouth of the LORD will give.
Rev 2:17 He who has an ear, let him hear what the Spirit says to the churches. To him who conquers I will give some of the hidden manna, and I will give him a white stone, with a new name written on the stone which no one knows except him who receives it.'
Rev 3:12 He who conquers, I will make him a pillar in the temple of my God; never shall he go out of it, and I will write on him the name of my God, and the name of the city of my God, the new Jerusalem which comes down from my God out of heaven, and my own new name.