Gen 16 pt. 2, Hagar-Ishmael-Islam

The angel of the LORD found her (Hagar) by a spring of water in the wilderness, the spring on the way to Shur. And he said, “Hagar, servant of Sarai, where have you come from and where are you going?” She said, “I am fleeing from my mistress Sarai.”
The angel of the LORD said to her, “Return to your mistress and submit to her.” The angel of the LORD also said to her, “I will surely multiply your offspring so that they cannot be numbered for multitude.”
And the angel of the LORD said to her, “Behold, you are pregnant and shall bear a son. You shall call his name Ishmael, because the LORD has listened to your affliction. He shall be a wild donkey of a man, his hand against everyone and everyone's hand against him, and he shall dwell over against all his kinsmen.” -Genesis 16:7-12

As for Ishmael, I have heard you; behold, I have blessed him and will make him fruitful and multiply him greatly. He shall father twelve princes, and I will make him into a great nation. -Genesis 17:20

Islamic traditions consider Ishmael to be the ancestor of Arab people,[2] excluding Arabs who are descendants of Ya'rub. Arabs who are from Ishmael-descendant tribes are occasionally referred to as "Arabized-Arabs" to highlight their ancestry. The Prophet Muhammad was of these Arabs
-Wikipedia