exonym

noun

1. An external name for a place, people or a language used by outgroup members (such as foreigners) instead of ingroup members (such as native-language speakers).

   “Recognizing that measures such as the categorization of exonym use, the publication of pronunciation guides for endonyms, and the formulation of guidelines ensuring a politically sensitive use of exonyms would help in the reduction of the number of exonyms, […]”

   ““Mandarin” is what linguists call an exonym, an external name for a place, people, or language. And exonyms often tell of a history of how cultures met, fought, and interacted.”