Genesis 30:9-11

Wycliffe Bible

⁹ (Then) Leah feeled that she ceased to bear child, and she gave Zilpah, her handmaid (her slave-girl), to her husband.

¹⁰ And when Zilpah, after conceiving, childed a son,

¹¹ Leah said, Blessedly (I am most fortunate); and therefore she called his name Gad.