Genesis 41:51

51Joseph called the name of the firstborn Manasseh. “For,” he said, “God has made me forget all my hardship and all my father’s house.”
 Manasseh sounds like the Hebrew for making to forget

Genesis 46:20

20And bto Joseph in the land of Egypt were born Manasseh and Ephraim, whom Asenath, the daughter of Potiphera the priest of cOn, bore to him.

Genesis 48:18

18And Joseph said to his father, “Not this way, my father; since this one is the firstborn, put your right hand on his head.”

Deuteronomy 21:17

17but he shall acknowledge the firstborn, the son of the unloved, by giving him a double portion of all that he has, for he is dthe firstfruits of his strength. eThe right of the firstborn is his.

Copyright information for ESV