“And she will bring forth a Son, and you shall call His name JESUS, for He will save His people from their sins.” So all this was done that it might be fulfilled which was spoken by the Lord through the prophet, saying: “Behold, the virgin shall be with child, and bear a Son, and** they shall call His name Immanuel**,” which is translated, “God with us.” (Matthew 1:21-23).
The set of alphabetic letters that Mary was to give this baby for a name was J-E-S-U-S.
The other verse says THEY will call him Immanuel. This is more like a title describing who he was something like a nickname. Think of it something like calling Chuck Berry the name “the Father of Rock n Roll.”