Zilpah

Zilpah is Leah's servant, handed to Jacob as a wife so Leah can continue producing sons and stay competitive in the household rivalry with Rachel.

Zilpah is listed here as the mother of Gad and Asher through Jacob — Leah's servant-wife whose sons complete the twelve, noted in the family census after the chapter's cascade of losses.

Zilpah is mentioned as the mother of other brothers in the group Joseph reports on — her sons among those whose resentment toward Jacob's favorite will soon turn into a conspiracy.

Zilpah is identified here as the source of Gad and Asher's lines — the servant given to Leah who became one of Jacob's wives and contributed sixteen people to the seventy entering Egypt.