[editor-surveyor]

>> His mother was supposed to name him “Immanuel” <<

.
No, not exactly.

Isaiah said that he would be called “Immanuel,” which means God present with us, and he indeed was and is.

[blasater1960]

"Isaiah said that he would be called “Immanuel,” "

In the Hebrew, is says AND she (his mother) WILL CALL HIS NAME (Shemo) Immanuel.

See it clearly says, that is what his name (shemo שְׁמֹו) will be...not that people will call him that.

http://www.blueletterbible.org/Bible.cfm?b=Isa&c=7&t=NASB#conc/14