And the angel of the Lord said unto her,.... Continued his discourse with her, informing her she should have a son, and what his name should be, and what his character, and the place of his habitation:behold, thou [art] with child; this she knew, and it is said, not for her information, as to this respect, but to lead on to something else he had to acquaint her with, she did not know.
Jarchi indeed would have the sense to be, "thou shall conceive" or "be with child", as was said to Manoah's wife, Jud 13:5; for it is a fancy of his, that Hagar had miscarried, and he, supposes the angel to promise her, that if she would return, or when she should return, she should conceive again; but this is said and supposed without any foundation:and shalt bear a son; this was what she hoped for, but was not certain of; but the angel assures her of it, that the child she went with was a son, which none could foretell but God, that is omniscient:and shall call his name Ishmael; the Jews observe, there were six persons who had their names given them before they were born, and Ishmael is one of them; the six were Isaac, Ge 17:19; Ishmael, here; Moses, Ex 2:10; Solomon, 2Sa 12:24; Josiah, 1Ki 13:2; and the Messiah, Isa 7:14: the reason of his name follows,because the Lord hath heard thy affliction: heard of it, had took notice of it, and observed, and fully understood the nature and cause of it; he had heard her groans and sighs under it, and her prayer and cries for deliverance from it; and so the Targum of Onkelos,"for the Lord hath received thy prayer,''which she had put up in her affliction, both when in the service of her mistress, and since her flight from her.
Pirke Eliezer, c. 32. Shalshalet Hakabala, fol. 2.