There is no such nation as, "Republic of Kongo." There is the Democratic Republic of the Congo, with its capital at Kinshasa, and there is the Republic of the Congo, with its capital at Brazzaville, but the former only seems to have an ethnic Kongo minority, but an influential and powerful one, and the country's first President, Joseph Kasa-Vubu, was ethnically Kongo, while the latter country seems to only have a negligible population of ethnic Kongo, many of whom are descendants of refugees of violence in Angola and the DRC. Both the DRC and the Republic of Congo are named after the river, not the ethnicity or kingdom, in any case.