Therefore the Lord himself will give you a sign: The virgin will conceive and give birth to a son, and will call him Immanuel.
All this took place to fulfill what the Lord had said through the prophet: “The virgin will conceive and give birth to a son, and they will call him Immanuel” (which means “God with us”).
I read this recently at PreceptAustin:
Have you ever wondered if you should spell Immanuel with an “I” or an “E?” The answer is that both are correct! Immanuel with an “I” is a transliteration of the original Hebrew word composed of ‘Immanu (with us) and El (God), while Emmanuel with an “E” is a transliteration of the Greek “Emmanouel.” The NET Bible is one of the few translations that maintains this distinction, translating Isa 7:14-note as Immanueland Mt 1:23-note as Emmanuel.