from H5973 and with a pronominal suffix inserted; with us (is) God; Immanuel, a type name of Isaiah's son; Immanuel.
Usages throughout the bible
Isaiah 8:8
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And he shall pass through Judah; he shall overflow and go over, he shall reach even to the neck; and the stretching out of his wings shall fill the breadth of thy land, O Immanuel. H6005