Common? Immanuel is common? Yes, people have been named variants of that name throughout the past two thousand years, but as I mentioned earlier, Immanuel is only found in THREE (threes are everywhere, btw...
http://kgov.com/three) places in Scripture, all in reference to Jesus. Twice in the Old Testament, in Isaiah, and once in the New Testament, in Matthew.
Therefore the Lord Himself will give you a sign: Behold, the virgin shall conceive and bear a Son, and shall call His name Immanuel. - Isaiah 7:14
http://www.biblegateway.com/passage/?search=Isaiah7:14&version=NKJV
He will pass through Judah, He will overflow and pass over, He will reach up to the neck; And the stretching out of his wings Will fill the breadth of Your land, O Immanuel. - Isaiah 8:8
http://www.biblegateway.com/passage/?search=Isaiah8:8&version=NKJV
“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 1:23
http://www.biblegateway.com/passage/?search=Matthew1:23&version=NKJV
In addition to that, you and those who reject that Jesus is God profane the name Immanuel by saying that it means "God is for us and not against us."
You know what profane means, right?