Adopted in the 1st Report of the Geographic Board of Canada, 1898.

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

Named by J. McLeod, Chief Trader, Hudson's Bay Company, who "discovered" this lake in 1834, after Peter Warren Dease (1788-1863), HBC superintendent of New Caledonia District, 1830-34.

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

"After Peter Warren Dease, in charge of New Caledonia for the Hudson's Bay Co.; accompanied Franklin's Arctic Expedition, 1825-27; senior officer of the Dease & Simpson Arctic Expedition 1837-39." (15th Report of the Geographic Board of Canada, 31 March 1917, a supplement to the Annual Report of the Department of the Interior, Ottawa, 1917.)

Source: included with note

Robert Campbell named the lake and river....

Source: Morice, Rev. A.G; Fifty years in western Canada; Toronto, 1930

"Named in 1834 by John McLeod, Chief Trader for the HBC. Dease entered the fur trade as an employee of the XY Company in 1801. Upon the union of the North West Company and the Hudson's Bay Company in 1821, he became a Chief Trader, and in 1828 he became a Chief Factor. In 1825 Governor Simpson wrote of him, a trifle incoherently: 'This gentleman is one of our best voyageurs, of a strong robust habit of body, possessing such firmness of mind joined to a great sauvity of manners, and who from his great experience in the country - would be a most valuable acquisition.' From 1831 to 1835, based at Fort St. James, Dease was in charge of New Caledonia. Dease was on Franklin's Arctic expedition of 1825-27 and on a second Arctic expedition in 1837-39. Because of his explorations, Queen Victoria granted him a Civil List pension of £100 per annum."

Source: Akrigg, Helen B. and Akrigg, G.P.V; British Columbia Place Names; Sono Nis Press, Victoria 1986 /or University of British Columbia Press 1997