9.7.2.1 Names of countries
Use this domain for the proper names of the countries that exist around the language community, especially those countries where your language is spoken. Include the name of your own country. Do not list every country in the world, unless your language has developed special names or pronunciations for those countries. Include any country that you refer to in your language, especially those names whose pronunciation you have adapted to fit your language. Give the form of the name that you use, rather than the official spelling. For instance the Japanese refer to their country as 'Nihon', but in English will call it 'Japan'. So
'Japan' is an English word and should go into an English dictionary. But 'Nihon' is not an English word and should not go in the dictionary.