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17:42, 6 July 2014 Re 3:12 Him that overcometh will I make a pillar in the temple of my God, and he shall go no more out: and I will write upon him the name of my God, and the name of the city of my God, [which is] new Jerusalem, which cometh down out of heaven from my God: and [I will write upon him] my '''new name'''.
When men are renamed in the OT, it is a symbol that Christ has died and been resurrected. You will find the man by the first name represents Christ before the cross, and with the new name, represents Christ after the cross.