Major Hart River adopted 13 November 1944 on 94/NE; not "Mosquito Creek" as had been labelled on BC map 1H, 1917. Re-approved 30 November 1944 on 94/NW, 7 March 1951 on 94M, 6 September 1951 on 94L and 17 January 1952 on 104I.

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office

After Major E.B. Hart, FRGS, who made the first reconnaissance survey of the area, 1913-14, and the first on record to map this particular watershed.

Source: BC place name cards, files, correspondence and/or research by BC Chief Geographer/Geographical Names Office.

"[In 1911] Major Hart of the RNWMP made an exploratory trip from Dease Lake across to Fort Nelson and then up the Prophet River to the point where it leaves the mountains..." (Bulletin 61: Report of Exploratory Trip in the Areas covered by Halfway River & Prophet River.) See also E.B. Hart's report of his 1912 and 1913-14 explorations, and government correspondence re: Hart's explorations, (Surveyor-General file 6952 and 6952A, respectively.)

Source: BC place name cards, files, correspondence and/or research by BC Chief Geographer/Geographical Names Office.

The Kaska name for this river is Ts'íhe Tú' (from Guzagi K'úgé, published by Kaska Tribal Council, Watson Lake, 1997). Origin/meaning not provided.

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office