Etymology

endonym

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Today it means: A name used by a group or category of people (an ingroup) to refer to themselves, their nation or their language, as opposed to a name given to them by other groups (outgroups). Full definition →

Ancient Greek ὄνυμα (ónuma) ← English endo- ← Proto-Hellenic *éndon
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The story

  1. Proto-Indo-European*h₁n̥dóm
  2. Proto-Hellenic*éndon
  3. Ancient Greekἔνδον (éndon)
  4. Englishendo-
  5. Ancient Greekὄνυμα (ónuma)
  6. English todayendonym

From endo- (“inside”) + -onym (“name”).

Etymology from Wiktionary, CC BY-SA 4.0.