Overview
Manasseh or Menashe was, according to the Book of Genesis, the first son of Joseph and Asenath. Asenath was an Egyptian woman whom the Pharaoh gave to Joseph as wife, and the daughter of Potipherah, a priest of On. Manasseh was born in Egypt before the arrival of the children of Israel from Canaan.
Biblical narrative
According to the biblical account in Genesis 41:51, the name Manasseh (given to him by Joseph) means "God has made me forget entirely my troubles and my father's house".
Jacob, Joseph's father, adopted Joseph's two sons, Manasseh and Ephraim, to share in Jacob's inheritance equally with Jacob's own sons. Manasseh is counted as the father of the Israelite Tribe of Manasseh, one of the twelve tribes of Israel. Jacob also blessed Ephraim over his older brother.
Manasseh had a son, Asriel, with his wife; and Machir with his Aramean concubine. and refer to a son called Jair, who "took all the region of Argob, as far as the border of the Geshurites and the Maachathites, and [who] called Bashan after his own name, Havoth Jair.
From Wikipedia (CC BY-SA 4.0).