From H5973 and with a pronominal suffix inserted; with us (is) God; Immanuel, a type name of Isaiah's son:—Immanuel.
Outline
Breakdown
The Hebrew word for maid
is עלמה (Ilamah) which merely means young woman without making distinction as to whether she has laid with a man or not, e.g. Proverbs 30:19
Strongs concordance
Strongs concordance