59 A concubine was a slave woman in ancient Near Eastern societies who was the legal property of her master, but who could have legitimate sexual relations with her master. A concubine’s status was more elevated than a mere servant, but she was not free and did not have the legal rights of a free wife. The children of a concubine could, in some instances, become equal heirs with the children of the free wife. After the period of the Judges concubines may have become more of a royal prerogative (2 Sam 21:10–14; 1 Kgs 11:3).
60 The name Abimelech means “my father is king.”

In other versions

And his concubine who was in Shechem also bore him a son, and he called his name Abimelech.

His concubine, who lived in Shechem, also bore him a son, whom he named Abimelek.

His concubine who was in Shechem also bore him a son, and he named him Abimelech.

He also had a concubine in Shechem, who gave birth to a son, whom he named Abimelech.

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

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

Public Domain