In Peoplese, being an international language, the name of each nation is generally the name used by the people who live in that nation.  For example, English "German" is Peoplese "Deutschland"; English “Japan” is Peoplese "Nihon".  (In texts, these names are often foonoted in English.)

Peoplese has two spelling versions:  training version Alike English (AE) (generally using English spelling) and pure Peoplese (in which sound and spelling are exactly in sync, thus the name Sound Spell Same, SSS).  (Explanation via orange Spelling tab above.)

ADJECTIVES.  The adjective of a nation is simply the nation's Peoplese name plus the “ee” sound (rhymes with “see”, “me”, “be”).  In Alike English Peoplese, this is spelled, e.g. Kenya۔y.  In SSS, “Kenya۔ē.

DEMONYMS.  A demonym is the name given to natives of a place or ethnicity.  In Peoplese a clear rule designates demonyms:  If the nation’s name ends in a vowel, we add “n”; e.g. Kenyans.  If the name ends in a consonant, we add “an”; e.g. Nohonans.  So no memorization required. 

NAMES OF NATIONS.  For each nation, Peopleses uses the most popular name used by locals.  If the nation has several names by several ethnicities, Peoplese uses the name of the ethnicity with the largest population.  If the name uses sounds or letters not in Peoplese, Peoplese modifies the spelling to the nearest equivalent.  E.g. Albanians refer to their nation as Shqiperia; in Peoplese nothing simillar to their “shqi” sound, so we modify the national name to “Sheperia” (SSS ꝭeperēa).  Pronunciation of geopolitical enties follows Peoplese’s clear pronunciation rules:  for two syllable words, the accent (syllable pronounced loudest) is on the first syllable, three and four syllable words on the second syllable, longer words on the third syllable.); in some cases this differs from local pronunciation, but no memorization is required.

[By contrast, for geopolitical entities, English uses colonial names (e.g. India), names of European explorers (Bering Strait), European grographically centered names (Middle East), mispronunciations (Fiji instead of Veedee).  In English the demonym, the adjective, and the accent pronunciation for each nation must be memorized.  Besides saving memorization (compared to English), in Peoplese ambiguity is eliminated.  For example, in English, "French" can refer to citizens of France, to an adjective of France (French cheese), or the language of France.  In Peoplese:  Francen citizens, France۔y cheese, France۔ese language.  Only names of nations need be memorized.]

China is an exception.  Citizens of China name their nation 中国 , romanized as Zhong-guo, which could be acceptable as "Zhonguo".  But demonym ”Zhonguon“ and adjective "Zhonguo۔y do not translate well in Chinese language.  Moreover, the national name "China", sometimes with slight variations, is known planet-around; e.g. Spanish, among other languages, also use the national name "China", as does Peoplese.

The name "United States of America" has gradually transitioned into a misnomer, meaning the nation comprised of united proviinces within regions in North America plus Hawaii island chain. "America" is the name of the hemisphere.  Peoplese retains "United States of America" to designate the nation, often shortened to English acronym "USA". USA-y is the adjective, and Usan is the demonym. 

Britain is an island containing England, Scotland, and Wales regions, each the homeland of a distinct but related ethniciy.  England, Scotland, Wales, and a region in northern Ireland comprise a sovereign nation named "United Kingdom of Great Britain and Northern Ireland" (often abbreviated "United Kingdom" or "UK"),

Below is a list of members of United Nations.