Judges 8:31

"And his concubine that was in Shechem, she also bare him a son, whose name he called Abimelech."

Cross References (ranked by relevance)

And Hagar bare Abram a son: and Abram called his son’s name, which Hagar bare, Ishmael.

And ye are risen up against my father’s house this day, and have slain his sons, threescore and ten persons, upon one stone, and have made Abimelech, the son of his maidservant, king over the men of Shechem, because he is your brother;)

Genesis 20:2

And Abraham said of Sarah his wife, She is my sister: and Abimelech king of Gerar sent, and took Sarah.

Genesis 22:24

And his concubine, whose name was Reumah, she bare also Tebah, and Gaham, and Thahash, and Maachah.