Fausset's Bible Dictionary
Son of Eliphaz, Esau's firstborn (Genesis 36:11-15). Related to the Amir Arabs E. of Jordan, also to amar "to speak," and emir "a chief."
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Fausset, Andrew R. Entry for 'Omar'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/o/omar.html. 1949.