Okay.
Isaiah 9:6 (NKJV) For unto us a Child is born, Unto us a Son is given; And the government will be upon His shoulder. And His name will be called Wonderful, Counselor, Mighty God, Everlasting Father, Prince of Peace.
The Child being born is Jesus, the only begotten Son of God. Jesus‘ names point to Himself and to the full Godhead (the Trinity). The Holy Spirit is our Counselor. The Everlasting Father is God the Father. Jesus is the Prince of Peace.
Well that is a novel understanding of the verse.
Let me also include verse 7 in the mix.
(Isa 9:6) For to us a child is born, to us a son is given; and the government will be on his shoulders. His name will be called Wonderful, Counsellor, Divine Warrior, Father of the Eternal Age, Prince of Peace.
(Isa 9:7) Of the increase of his government and of peace there shall be no end, on the throne of David, and on his kingdom, to establish it, and to uphold it with justice and with righteousness from that time on, even forever. The zeal of Yahweh of Armies will perform this.(NEV)
(Isa 9:6) A child has been born for us. We have been given a son who will be our ruler. His names will be Wonderful Advisor and Mighty God, Eternal Father and Prince of Peace.
(Isa 9:7) His power will never end; peace will last forever. He will rule David's kingdom and make it grow strong. He will always rule with honesty and justice. The LORD All-Powerful will make certain that all of this is done.(CEV)
(Isa 9:6) For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace.
(Isa 9:7) Of the increase of his government and peace there shall be no end, upon the throne of David, and upon his kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever. The zeal of the LORD of hosts will perform this.(KJV)
Isaiah 9:6-7 is said to belong to some leader after King David or Jesus. Let's go with Jesus Christ as you also indicate.
The context of these two verses of Isaiah 9:6-7, is about the future King of the throne of David. Judah’s current enemies were to the North, Israel and Assyria.
A child is born and given by whom? It would be by God, his Spirit gave us a son.
This child will have a government to rule. It will be his sole responsibility.
It would indicate that God gives his Son this government. After his resurrection from death, the Son of God shall have all authority on the earth and in heaven. This is the government given to him by his Father, based on the same throne originating from King David.
Now ‘Mighty God’ should be translated as ‘mighty warrior’ or ‘great one.’
This phrase "El gib(b)or" is also used in Ezekiel 32:21 and translated "the mighty chiefs". One of the definitions under "El" is mighty men, men of rank, mighty heroes and would seem more fitting since the very next verse says "Of the increase of his government and of peace there will be no end, on the throne of David an over his kingdom, to establish it and to uphold it"
Where in scripture had Jesus been called the everlasting Father? Nowhere. I would think that Trinitarians at least would be weary of saying Jesus was any kind of a Father, because their God is composed of the Father and the Son, and their Johnny come lately other person, the Holy Spirit. And they can never be the same person - they stay in their own lanes I would think according to their proponents of this doctrine.
‘Everlasting Father’ should be translated as the eternal father,
of the future ages to come since his ascension into heaven. Jesus became the key agent of eternal life. Jesus replaced the original 'Aam' and temporal father, also a Son of God, as he, the 1st Adam, returned to the ‘dust.’ Jesus purchased sinful mankind and became their new permanent father of future ages as the 2nd and last Adam. He became immortal and the gateway for all others to enter in.
Yahshua fathered the new creation of believers from mankind. He created the mechanism for it.
He became the father of it, the firstborn from the dead, this human process from human death to salvation and immortality. He thus became the unique Father everlasting, the first and the last or the only one in this specific regard. The first and the last or the only one as spoken of in the Book of Revelation and only in this context.
Jesus was the founder, and he is
the father of new believers; of the new creation (not Genesis). He was the first of the new creation of human beings given immortality. He was the author of life for all men.
Acts 17:30-31 says that YHWH has appointed a man to judge the world that aligns perfectly with the verses of Isaiah 9:6 and 7.
The last part of verse 7 says the zeal of the LORD Almighty will produce this child who will accomplish or be all these things said in these verses. The LORD Almighty will use his Holy Spirit to create this new Son, lead him to the Cross, and bring him to the realm of holy royalty.
This is another validation that the LORD is the only God, the only creator, and it is ridiculous and impossible for his created Son to be him.
And the LORD God will ensure (his zeal) that all this will transpire in the future and beyond.