Adopted 1917 by Geographic Board of Canada, as labelled on BC map 4G, 1914, and on BC-Alberta boundary sheet # 12, 1916.

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

Named in association with Mount Assiniboine, in turn named after the Assiniboine (Stoney) [Indigenous Peoples], who hunted in the Rocky Mountains from the 49th parallel to the North Saskatchewan-Athabasca watershed; the name means "those who cook by placing hot stones in water".

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

"...These [Indigenous People] were originally from the south and belonged to the Sioux. The Crees called them 'Assin Bwan" (Stony Sioux), hence the name of the river (Assiniboine) on the banks of which they camped. The original name of the river, on an old map, is 'Stone Indian' river, so named from the way in which they heated water to cook with. Stones were made very hot and put into vessels made of the clay on the banks of the river...". (10 March 1913 letter from A.H. Whitcher, Geographic Board of Canada, to James White; published in "Place Names in Vicinity of Yellowhead Pass, Canadian Alpine Journal, vol VI, 1914-15, pp.143-158)

Source: included with note