Bastard: Ishmael

So after he had lived in Canaan for ten years, his wife Sarai took her Egyptian maidservant Hagar and gave her to Abram to be his wife.

And Hagar bore Abram a son, and Abram gave the name Ishmael to the son she had borne.

For it is written that Abraham had two sons, one by the slave woman and the other by the free woman.