Manasseh or Menashe (Hebrew: מְנַשֶּׁה, Modern Menaše, Tiberian Mənaššé Samaritan Manaṯ) was, according to the Book of Genesis, the first son of Joseph and Asenath. (Genesis 41:50-52) Asenath was an Egyptian woman whom Pharaoh gave to Joseph as wife, and the daughter of Potipherah, a priest of On. (Genesis 41:50-52) Manasseh was born in Egypt before the arrival of the children of Israel from Canaan. (Genesis 48:5)
Jacob, Joseph's father, adopted Joseph's two sons, Manasseh and Ephraim, to share in Jacob's inheritance equally with Jacob's own sons. (Genesis 48:5) He is counted as the founder of the Israelite Tribe of Manasseh, one of the twelve Israelite tribes. Jacob also blessed Ephraim over his older brother. (Genesis 48:20) "Manasseh" in Hebrew means "forgetful."