eponymy

[ uh-pon-uh-mee ]
/ əˈpɒn ə mi /
|

noun

the derivation of names from eponyms.

Origin of eponymy

First recorded in 1860–65, eponymy is from the Greek word epōnymía surname, derived name. See eponymous, -y3
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British Dictionary definitions for eponymy

eponymy

/ (ɪˈpɒnɪmɪ) /

noun

the derivation of names of places, etc, from those of persons
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