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eponym

[ep-uh-nim]
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noun
  1. a person, real or imaginary, from whom something, as a tribe, nation, or place, takes or is said to take its name: Brut, the supposed grandson of Aeneas, is the eponym of the Britons.
  2. a word based on or derived from a person's name.
  3. any ancient official whose name was used to designate his year of office.
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Origin of eponym

First recorded in 1840–50; back formation from eponymous
Related formsep·o·nym·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for eponymic

eponym

noun
  1. a name, esp a place name, derived from the name of a real or mythical person, as for example Constantinople from Constantine I
  2. the name of the person from which such a name is derivedin the Middle Ages, "Brutus" was thought to be the eponym of "Britain"
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Derived Formseponymic, adjective

Word Origin

C19: from Greek epōnumos giving a significant name
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for eponymic

eponym

n.

one whose name becomes that of a place, a people, an era, an institution, etc., 1846, from Greek eponymos "given as a name, giving one's name to something," from epi "upon" (see epi-) + onyma, Aeolic dialectal variant of onoma "name" (see name (n.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

eponymic in Medicine

eponym

(ĕpə-nĭm′)
n.
  1. A name of a drug, structure, or disease based on or derived from the name of a person.
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Related formsep′o•nymic adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.