Judges 8:31

And the servant-wife he had in Shechem had a son by him, to whom he gave the name Abimelech.

Genesis 16:15

And Hagar gave birth to a child, the son of Abram, to whom Abram gave the name of Ishmael.

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 servant Reumah gave birth to Tebah and Gaham and Tahash and Maacah.

Judges 9:1-5

Now Abimelech, the son of Jerubbaal, went to Shechem to his mother's family, and said to them and to all the family of his mother's father,

Judges 9:18

And you have gone against my father's family this day, and have put to death his sons, even seventy men on one stone, and have made Abimelech, the son of his servant-wife, king over the townsmen of Shechem because he is your brother;)

Treasury of Scripture Knowledge

Summary

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

Bible References

Concubine

Judges 9:1
Now Abimelech, the son of Jerubbaal, went to Shechem to his mother's family, and said to them and to all the family of his mother's father,
Genesis 16:15
And Hagar gave birth to a child, the son of Abram, to whom Abram gave the name of Ishmael.
Genesis 22:24
And his servant Reumah gave birth to Tebah and Gaham and Tahash and Maacah.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain