Rev 2:17 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.'
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.
It seems you are confused what is written in the bible revelation 2:17 is the church of contstantine this is where all corruption started , what was the manna christ gave?
63 It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.
Thus the hidden manna is the hidden word of god not corrupted by the romans , there were peoople in that time who had the real word of god they know his name while the romans where yelling deus vult and killing many