Genesis 30:19-20

30:19 Leah became pregnant again and gave Jacob a son for the sixth time. 30:20 Then Leah said, “God has given me a good gift. Now my husband will honor me because I have given him six sons.” So she named him Zebulun.

Genesis 46:14

46:14 The sons of Zebulun:

Sered, Elon, and Jahleel.