You searched for: “exonym
1. A name by which one people or social group refers to another and by which the group so named does not refer to itself.
2. The name of a city or other place used in a foreign language which is not the same at the originating language; such as, Florence (English) for Firenze (Italian).

Additional examples: Londres (French) an exonym for London, Germany (English) is an exonym because Germans use the term Deutschland.