Kongo (mto)
Katika karne za 16 na 17 mto ulijulikana kwa majina yote mawili jinsi inavyoonekana katika maandishi ya siku zile, kwa mfano Mwingereza James Barbot aliandika mwaka 1746 juu ya safari kwenda mto "Kongo au Zaire" ("Voyage to Congo River, Or the Zair") <ref>James Barbot, An Abstract of a Voyage to Congo River, Or the Zair and to Cabinde in the Year 1700 (1746). Mifano mingine inayotaja majina yote mawili: James Hingston Tuckey, Narrative of an Expedition to Explore the River Zaire, Usually Called the Congo, in South Africa, in 1816 (1818), (via google books, imetazamiwa May 2016). "Congo River, called Zahir or Zaire by the natives" John Purdy, Memoir, Descriptive and Explanatory, to Accompany the New Chart of the Ethiopic Or Southern Atlantic Ocean, 1822, p. 112.</ref>