At the end of Matthew, we do know his name, for Christ tells the apostles: “Go therefore to all the nations, baptizing them in the Name of the Father, and of the Son and of the Holy Spirit.”
The apostles knew the name (in the singular, not ‘names’). Jesus had told them to do everything in his name. That’s the same name that he said was his Father’s, and not his own. As he told the Jews (John 5:43): “...if another shall come in his own name, him you will receive.”
In his prayer to the Father before going to the garden (John 17), he said in vs 6: “I have manifested thy name unto the men which thou gave at me out of the world...”. And in vs 26: “And I have declared unto them thy name, and will declare it...”.
And in Hebrews 1:4, the writer says: “...as he hath by inheritance obtained a more excellent name than they.”
The command given in Matthew 28:19 is obeyed by using the name of Jesus, as shown by the examples given in Acts 2:38; 8:16; 19:5.
Also Acts 10:48 and 22:16. I know they don’t say the name in those two; just “in the name of the Lord”. But, as Peter said in Acts 2:36: “..God hath made that same Jesus, whom ye have crucified, both Lord and Christ.”
I know that Trump is called by some “the Donald”, but proper names don’t use ‘the’ in front of the name; although titles do. Such as ‘the King’, or ‘the President’.
The name above all others is Jesus (Acts 4:12).
Ever notice that when people curse, and use a name from the Bible, it’s not the trinitarian formula?
The devil hates the name of Jesus.