Ephraim in Fausset's Bible Dictionary

("doubly fruitful".) Joseph's second son by Asenath, named so, "for," said Joseph, "God hath caused me to be fruitful in the land of my affliction." Born during the seven plenteous years; the "doubly fruitful" may refer to both the fruitfulness vouchsafed to Joseph and the plenty of the season. As regards Ephraim himself, he was doubly blessed: (1) in being made, as well as Manasseh, a patriarchal head of a tribe, like Jacob's immediate sons (Genesis 48:5); as Judah received the primary birthright (Reuben losing it by incest, Simeon and Levi by cruelty), and became the royal tribe from whence king David and the Divine Son of David sprang, so Ephraim received a secondary birthright and became ancestor of the royal tribe among the ten tribes of Israel (Genesis 49:3-10; Genesis 49:22-26). (2) Ephraim the younger was preferred to Manasseh the elder, just as Jacob himself was preferred before the elder Esau. Jacob wittingly guided his hands so as to lay his right on Ephraim and his left on Manasseh, notwithstanding Joseph's remonstrance; saying, "Manasseh shall be great, but his younger brother shall be greater than he, and his seed shall become a multitude of nations." Jacob called to mind God's promise at Luz, "I will make thee fruitful," a Hebrew word related to Ephraim and to Ephrath, the scene of the death of his darling wife, Ephraim's grandmother (Genesis 35:11; Genesis 35:16; Genesis 48:4; Genesis 48:7; Genesis 48:13-19). Ephraim was about 21 when Jacob blessed him, for he was born before the seven years' famine, and Jacob came to Egypt toward its closing years, and lived 17 years afterward (Genesis 47:28)...