Genesis 30:4-13

So she gave him Bilhah her maid as a [secondary] wife, and Jacob went in to her. Bilhah conceived and gave birth to a son for Jacob. Then Rachel said, “God has judged and vindicated me, and has heard my plea and has given me a son [through my maid].” So she named him Dan (He judged). Bilhah, Rachel’s maid, conceived again and gave birth to a second son for Jacob. So Rachel said, “With mighty wrestlings [in prayer to God] I have struggled with my sister and have prevailed.” So she named him Naphtali (my wrestlings). When Leah saw that she had stopped bearing [children], she took Zilpah her maid and gave her to Jacob as a [secondary] wife. Zilpah, Leah’s maid, gave birth to a son for Jacob. Then Leah said, “How fortunate!” So she named him Gad (good fortune). Zilpah, Leah’s maid, gave birth to a second son for Jacob. Then Leah said, “I am happy! For women will call me happy.” So she named him Asher (happy).