Adopted 2 November 1937 on 93K/15 as an established name as listed in 1930 Gazetteer and as labeled on Reference Map 1G "Cariboo and Adjacent Districts" (1916), Reference Map 3C "Stuart Lake" (1923), Reference Map 1H "BC, Northern" (1917), and as likely appears on Geological Survey of Canada Map 630A "Fort Fraser - East, West" (1938). Previously labeled as Tachi River (Reference Map 3C "Stuart Lake" 1913, 1914). Likely named in association with Tachie (Community), which is recorded as being named in association with the Yekooche name for Tachie (see Tachie, community).

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

According to Dick Walker of the Summer Institute of Linguistics at Fort St. James, with information submitted by Randy Bouchard of B.C. Indigenous Language Proect, in Dak'elh "ta" means three and "che" means "outlet" or "tail," so "tache" is recorded as translating to three outlets (recorded as being in reference to the 3 outlets of the Tachie River).

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

Headwaters at 54 39 - 124 46 on 93K/10.

Source: Canadian Geographical Names Database, Ottawa

Recorded as possibly being named after Bishop Tache, archbishop of St. Boniface, by Gaston Carriere (S.1.52, L.I. 23.5.56).

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