exonym

[ ek-soh-nim ]
/ ˈɛk soʊ nɪm /

noun

a name used by foreigners for a place, as Florence for Firenze.
a name used by foreigners to refer to a people or social group that the group itself does not use, as Germans for Deutsche.

British Dictionary definitions for exonym

exonym
/ (ˈɛksəˌnɪm) /

noun

a name given to a place by foreigners Londres is an exonym of London

Word Origin for exonym

C20: from Greek ex- 1 + -onym