Adopted 6 December 1921, as labelled on BC-Alberta boundary sheet 27.

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

Named "McGillivray's Rock" by J. Henry, North West Company, after William McGillivray (1764-1825), North West Company partner; Lower Canada Assembly 1808-09; Council 1814-25. Fort William, Ontario is also named after him. (Simpson's Athabasca Journal, 452)

Source: Provincial Archives of BC "Place Names File" compiled 1945-1950 by A.G. Harvey from various sources, with subsequent additions

This massif looms over Committee Punch Bowl (lake) in Athabasca Pass, and runs in a general northwesterly direction, cutting across the interprovincial boundary; most of the 2-mile long summit ridge is in Alberta.

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

"....after William McGillivray." (John Work's diary, 10 October 1823). William McGillivray (1764-1825), elder brother of Simon McGillivray and uncle of Duncan McGillivray, was one of the leading members of the North West Company; he was a member of the House of Assembly of Lower Canada, 1808-09, for Montreal West, and of the Legislative Council of Lower Canada 1814-25; he died in 1825 in London, England.

Source: Place Names of Alberta, Alberta Geographical Names Program and Friends of Geographical Names of Alberta Society, University of Calgary Press, 4 volumes, 1991-1996.