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Most Germanic and Romance languages have cognate endings for the adjective describing a country/people.
For example,
English uses -ish or -ese;
German uses -isch;
French uses -ais, -ois etc;
Spanish and Portuguese use -es.
The challenge here is to concoct a fictional scenario in which a Germanic or Romance language uses -ases as its suffix, as in the old AH.com joke Sudanases for Sudanese and Chineases for Chinese.