English word ethnonymy comes from English -onymy, English ethno-

Detailed word origin of ethnonymy

Dictionary entry	Language	Definition
-onymy	English (eng)	Used to form nouns describing the the study, formation, or use of words or names.
ethno-	English (eng)	Race; ethnicity (in the sense of classification of human beings).
ethnonymy	English (eng)	(linguistics) the naming of people, the creation of ethnonyms.

Words with the same origin as ethnonymy