The meaning of Ephraim, Mount in the Bible
(From International Standard Bible Encyclopedia)

(har 'ephrayim): Means that part of the mountain which fell to Ephraim (Joshua 19:50, etc.). The natives speak today of Jebel Nablus, Jebel Cafed, etc., meaning that section of the central range which is subject to each city. It is better therefore to retain the rendering of the King James Version, and not to read with the Revised Version (British and American) "hill-country of Ephraim."

See more on the meaning of Ephraim, Mount in the Bible:
Ephraim, Mount {Easton's Bible Dictionary}

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