Countries Nouns and Adjectives Ending in "ese" -- in American English

The adjectival suffix -ese also serves both common and proper nouns (academese, Japanese); the former usage invariably refers to a type of jargon and is usually pejorative, with a connotation of obtuseness or pretension, whereas the latter usage is neutral unless placed in a derogatory context.

#	Country	Noun Singular	Noun Plural	Adjective
1.	Benin	Beninese	Beninese	Beninese
2.	Burma	Burmese	Burmese	Burmese
3.	China	Chinese	Chinese	Chinese
4.	Congo, Democratic Republic of	Congolese	Congolese	Congolese
5.	Faroe Islands	Faroese	Faroese	Faroese
6.	Gabon	Gabonese	Gabonese	Gabonese
7.	Guyana	Guyanese	Guyanese	Guyanese
8.	Japan	Japanese	Japanese	Japanese
9.	Lebanon	Lebanese	Lebanese	Lebanese
10.	Malta	Maltese	Maltese	Maltese
11.	Marshall Islands	Marshallese	Marshallese	Marshallese
12.	Portugal	Portuguese	Portuguese	Portuguese
13.	San Marino	Sammarinese	Sammarinese	Sammarinese
14.	Senegal	Senegalese	Senegalese	Senegalese
15.	South Sudan	South Sudanese	South Sudanese	South Sudanese
16.	Sudan	Sudanese	Sudanese	Sudanese
17.	Suriname	Surinamer	Surinamers	Surinamese
18.	Taiwan	Taiwan	Taiwan	Taiwan or Taiwanese
19.	Timor-Leste	Timorese	Timorese	Timorese
20.	Togo	Togolese	Togolese	Togolese
21.	Vietnam	Vietnamese	Vietnamese	Vietnamese