Judges 8:31

His concubine who [was] in Shechem also bore for him a son, and {he named him} Abimelech.

Genesis 16:15

And Hagar had a child for Abram, a son. And Abram called the name of his son whom Hagar bore to him, Ishmael.

Genesis 20:2

And Abraham said about 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, also bore Tebah, Gaham, Tahash, and Maacah.

Judges 9:1-5

And Abimelech son of Jerub-Baal went to Shechem, to the relatives of his mother, and he said to them and to the house of his mother's father,

Judges 9:18

but today you have risen against the house of my father and killed his sons, seventy men on one stone, and you have made Abimelech, the son of his slave woman, a king over the lords of Shechem, because he is your relative--

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
And Abimelech son of Jerub-Baal went to Shechem, to the relatives of his mother, and he said to them and to the house of his mother's father,
Genesis 16:15
And Hagar had a child for Abram, a son. And Abram called the name of his son whom Hagar bore to him, Ishmael.
Genesis 22:24
And his concubine, whose name was Reumah, also bore Tebah, Gaham, Tahash, and Maacah.