Dear fellow christian, judge not lest you be judged

A specific prophecy that Christians often point to as verifying the Messiah as Jesus is
Isaiah 7:14--(KJV)Therefore the Lord himself shall give you a sign; Behold,a virgin shall conceive,and bear a son, and shall call his name Immanuel.
According to Strong`s Concordamce, Immanuel occurs twice
Isaiah 7:14--above
Isaiah 8:8--And he shall pass through Judah; he shall overflow and go over,he shall reach even to the neck; and the stretching out of his wings shall fill the breadth of the land, O Immanuel.
The other related Scripture is for Emmanuel
Matthew 1:23--Behold, a virgin shall be with child, and shall bring forth a son,and they shall call his name Emmanuel, which being interpreted is, God with us.
Going back to the original prophecy
'A virgin will conceive'--agreed
'And bear a son'--agreed
'and shall call his name Immanuel'--?
Nowhere in the whole of the NT is Jesus ever referred to as Immanuel apart from the mini-prophecy in Matthew which was written after the events of Jesus` life were over.
Therefore, using Isaiah`s prophecy, Jesus can not be the Messiah. Now I know the ducking and weaving will start about the 'interpretation' of the name is what counts, but the prime reading of Isaiah is unfulfilled. Jesus was never Immanuel.

Then Isaiah 7:14 is not a prophecy of Jesus?