Tribe of Ephraim: Descended from Joseph's Second Son Adopted by Jacob
Source: TTT
Genesis 41:52
And the second son he named Ephraim, saying, “God has made me fruitful in the land of my affliction.”
Genesis 48:5
And now your two sons born to you in Egypt before I came to you here shall be reckoned as mine; Ephraim and Manasseh shall be mine, just as Reuben and Simeon are mine.