Genesis 30:8-12

So Rachel said, “With mighty wrestling I have wrestled with my sister, and I have indeed prevailed.” And she named him Naphtali.

When Leah saw that she had stopped having children, she took her slave Zilpah and gave her to Jacob as a wife.

And Leah’s slave Zilpah bore Jacob a son.

Then Leah said, “How fortunate!” So she named him Gad.

And Leah’s slave Zilpah bore Jacob a second son.