Ishmael. But he was not born of Sarah, and not part of God’s promise.
Yeah, I know, that’s where the muslims think the Jews got the story wrong. That is where some of the conflict is.
And the evil prophet did not come along until thousands of years later. Islam was not codified into a religion until 600 AD or so when a murderous pedophile received inspiration from Satan. Other than that it is much the same as Judiasm and Christianity.... (do I need the /s)