"According to the Hebrew Bible, the Tribe of Ephraim (Hebrew: אֶפְרַיִם / אֶפְרָיִם, ʾEfrayim) was one of the Tribes of Israel. The Tribe of Manasseh together ...
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with Ephraim formed the House of Joseph. It is one of the ten lost tribes. The etymology of the name is disputed." - (en.wikipedia.org 19.10.2020)