In an e-mail titled "Does Jesus have two given names?" a reader writes:
How does Mary and Joseph naming their infant "Jesus" square with
Isaiah’s prophecy that his name shall be Immanuel? In Matthew the
angel revealed to Joseph that Mary, "will bear a son, and you shall
call his name Jesus, for he will save his people from their sins." All
this took place to fulfill what the Lord had spoken by the prophet:
"Behold, the virgin shall conceive and bear a son, and they shall call
his name Immanuel" (which means, God with us)." (Matt.1:21-23)
This is one of those cases where the solution lies in the nature of prophetic fulfillment.
The starting point to unraveling the mystery is to go back into the Old Testament and look at the prophecy in its original context. The passage being quoted is Isaiah 7:14, which is a famous Messianic prophecy. But in its original context, it has a different signification.
In Isaiah 7, God has sent the prophet Isaiah to King Ahaz of Judea that the king of Syria and his ally, the king of the northern ten tribes (Israel) will not be able to conquer Judea. In fact–the northern kingdom of Israel is to itself be conquered (a reference to theconquest by the Assyrians and subsequent deportation that Israel suffered). To convince Ahaz that this prophecy is true, he invites the king to name a sign for God to give him, and Ahaz refuses, saying that he will not but God to the test. This was the wrong thing to say, and Isaiah responds:
"Hear then, O house of David! Is it too little for you to weary men, that you weary my God also? Therefore the Lord himself will give you a sign. Behold, a young woman shall conceive and bear a son, and shall call his name Imman’u-el. He shall eat curds and honey when he knows how to refuse the evil and choose the good. For before the child knows how to refuse the evil and choose the good, the land before whose two kings you are in dread will be deserted.
Now, there are two things about this passage that help us understand its original reference, and I’ve put them in blue.
The first is that the birth of the child is supposed to be a sign that God is giving to King Ahaz, since Ahaz refused to name a sign for himself. The purpose of this sign is to convince Ahaz that his kingdom really will not be conquered by Syria and the northern kingdom of Israel.
Ahaz reigned from appropximately 735 B.C. to 715 B.C., so it would do him no good at all if the sign were not to be fulfilled for over seven hundred years. That would (a) be long after he was dead and (b) long after the then-existing situation with Syria and Israel was over. It could scarcely serve as a sign backing up the truth of Isaiah’s prophecy concerning the situation.
This points us to look for the original fulfillment of the prophecy to be within the life of Ahaz, which ended in 715 B.C.
The second thing about the passage which helps us understand its original reference is the fact that it says before the child knows how to refuse the evil and choose the good (i.e., avoid things that will hurt him and accept things that will help him), that the lands he is afraid of will get conquered. Now, the conquest of Israel by the Assyrians happened around 721 B.C., and it’s possible that the conquest mentioned in the prophecy is an even earlier one, which occurred in the 730s B.C.
So once again we’re pointed toward a child born in the 8th century B.C.
This child was not, in all likelihood, born of a virgin. The term that is used in Hebrew–almah–refers to a young woman. It is commonly assumed that an almah was a virgin, and the Septuagint translates it thus in Greek (parthenos), but that is not what the Hebrew requires.
This child may have literally been named Emmanuel, though not necessarily. Since "Immanuel" means "God (is) with us" and since saying that God is with us is a common idiom in the Old Testament for saying "we will be victorious" or "things will go well for us," the child’s prophetic "name" may not have been what he was literally called on a daily basis but may be taken as an expression of the fact that the child is a sign from God that God is with his people and their country will not be conquered by the alliance Ahaz feared. Or, in a third possibility, Immanuel may have been the literal name of someone who also had another name, such as was the case with kings, who took regnal names upon their accession to the throne. Thus some have speculated that Immanuel was King Hezekiah, who succeeded Ahaz and lived during the fulfillment of the prophecy. (Whether any have argued that Immanuel was Hezekiah’s birth name, I don’t know.)
However that may be, prophecy often has more than one fulfillment, and the authors of the New Testament recognized a deeper, Messianic fulfillment in the prophecy. There would come who truly was born of a Virgin and who truly was God with us, and thus Matthew sees in the prophecy of Isaiah a second, greater fulfillment in the person of Christ.
This is thus one of several passages in the New Testament that reveals that the sacred authors had a somewhat different idea of prophetic fulfillment than we tend to today. We tend to assume that, if Thing X fulfills Prophecy Y then X must be one and only fulfillment of Y, literal in all its details.
Not so to the authors of Scripture. To them, a prophecy might have multiple fulfillments, not all of which were equally primary and not all of which were equally literal. Some fulfillments might echo or reflect or correspond to the original prophecy, without its being its primary fulfillment.
That’s what we have here: A child born in Ahaz’s reign is the primary fulfillment of the prophecy, but within the spiritual sense of the text is another, grander, and later fulfillment that points to Jesus. We should not understand from Matthew’s application of this prophecy to Jesus that he was literally named Immanuel in the same sense that he was named Jesus. The application of "God with us" to Jesus is something that goes beyond being a name in the conventional sense–even in the conventional Hebrew sense–and applies to him directly as a descriptor of his Person. Jesus is literally God with us in the flesh.
What Matthew is doing, therefore, is taking a text from Isaiah and discerning within it (which is to say, within its spiritual meaning) a prophecy of a Virgin Birth leading to God Incarnate being with us.
Incidentally, here’s a tip for understanding how some New Testament fulfillments of Old Testament prophecies work: To avoid the trap of thinking that each Old Testament prophecy has one and only one fulfillment, which is the one the New Testament records, or that the New Testament fulfillment must be the primary fulfillment of the prophecy or that all the details of the New Testament fulfillment have to match those of the Old Testament prophecy, try replacing the word "fulfills" with a broader word, like "corresponds to" or "reflects" or "echoes," to reflect the broader understanding that the biblical authors had.
In a particular case, they may have meant only " . . . and this reflects what was said by Isaiah the prophet" instead of " . . . and this is the one and only literal-in-all-its-details fulfillment of what was said by Isaiah the proiphet."