Isa 7:14 - Mt 1:23

[BC Editor]

Dear all,
Mt 1:22-23 mentions that something was fulfilled which was "said by the prophet", and almost always it is interpreted as a reference to what Isa 7:14 says:

Isa 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.

A question arises as to how Isa 7 was fulfilled in Mt 1, seeing - for example - that Jesus himself was never named or called "Immanuel"? He was named "Jesus", cp both Mt 1:25 (Joseph called his name Jesus) and also Lk 1:31 (the angel Gabriel telling Mary that she should call her son's name Jesus).
Another question arises, how the fulfillment of this prophecy could be a sign for the king in Isaiah's time, seeing that Jesus was born many centuries later? (cp also the topic on "double fulfillment of prophecy")
Input and further insights are appreciated.

[Durbin]

I have no input but would like to see some! I can take Matthew's account as true and inspired of God and that's that but I'd like to see other views. Like this is just tradition recorded by Matthew and simply his interpretation without much more comment on it than he said in the context or even that is not a fulfillment and why.

By the way, was this fulfilled in Isaiah's time and when, where, how?