word | | Nationality |
| Congo | Congo, Democratic Republic of the | noun: Congolese (singular and plural) adjective: Congolese or Congo |
| Congo | Congo, Republic of the | noun: Congolese (singular and plural) adjective: Congolese or Congo |
| Congolese | Congo, Democratic Republic of the | noun: Congolese (singular and plural) adjective: Congolese or Congo |
| Congolese | Congo, Republic of the | noun: Congolese (singular and plural) adjective: Congolese or Congo |
| Cook | Cook Islands | noun: Cook Islander(s) adjective: Cook Islander |
| Costa | Costa Rica | noun: Costa Rican(s) adjective: Costa Rican |
| Croat | Croatia | noun: Croat(s), Croatian(s) adjective: Croatian |
| Croatian | Croatia | noun: Croat(s), Croatian(s) adjective: Croatian |
| Cuban | Cuba | noun: Cuban(s) adjective: Cuban |
| Cypriot | Cyprus | noun: Cypriot(s) adjective: Cypriot |
| Czech | Czech Republic | noun: Czech(s) adjective: Czech |
| Dane | Denmark | noun: Dane(s) adjective: Danish |
| Danish | Denmark | noun: Dane(s) adjective: Danish |
| Djiboutian | Djibouti | noun: Djiboutian(s) adjective: Djiboutian |
| Dominican | Dominica | noun: Dominican(s) adjective: Dominican |