Cyclopedia of Biblical, Theological and Ecclesiastical Literature
(Hebrew Amalek', עֲמָלֵק, according to Furst, from the Arabic, dweller in a valley; Sept. Ἀμαλήκ, Vulg. Amalech, Amalec), the son of Eliphaz (the first-born of Esau) by his concubine Timna (Genesis 36:12; 1 Chronicles 1:36); he was the chieftain, or emir ("Duke"), of an Idumaean tribe (Genesis 36:16); which, however, was probably not the same with the AMALEKITES (See AMALEKITES) (q.v.) so often mentioned in Scripture (Numbers 24:20, etc.). B.C. post 1905. His mother came of the Horite race, whose territory the descendants of Esau had seized; and, although Amalek himself is represented as of equal rank with the other sons of Eliphaz, yet his posterity appear to have shared the fate of the Horite population, a "remnant" only being mentioned as existing in Edom in the time of Hezekiah, when they were dispersed by a band of the tribe of Simeon (1 Chronicles 4:43).
These files are public domain.
McClintock, John. Strong, James. Entry for 'Amalek'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/a/amalek.html. Harper & Brothers. New York. 1870.