Genesis 29:31-34

Now when the LORD saw that Leah was unloved, He made her able to bear children, but Rachel was barren. Leah conceived and gave birth to a son and named him Reuben (See, a son!), for she said, “Because the LORD has seen my humiliation and suffering; now my husband will love me [since I have given him a son].” Then she conceived again and gave birth to a son and said, “Because the LORD heard that I am unloved, He has given me this son also.” So she named him Simeon (God hears). She conceived again and gave birth to a son and said, “Now this time my husband will become attached to me [as a companion], for I have given him three sons.” Therefore he was named Levi.