Sheffield Mountain adopted 30 November 1944 on 94SW, as submitted 27 May 1935 by Frank Swannell, BCLS (in turn at the request of E.C.W. Lamarque, DLS), and as labelled on Swannell's map of the 1934 Bedaux Expedition, plan 5T324. Form of name changed to "Mount Sheffield" 1 October 1953 on 94 F.

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

Named by E.C.W. Lamarque, DLS, as a result of his exploration and survey as advance party to the Bedaux Expedition, 1934.

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

Believed to refer to one or other of the Sheffield brothers, Bert or Kelly, both trappers in the area. "Bert Sheffield and his brother Kelly were both trappers in the area and, like many trappers of that time, they were happy to get work in the off season with various expeditions. Bert and his partner Henry Couvousier trapped along the Muskwa River and up to the Tuchodi Lakes. They pulled off the "Great Fur Robbery" at Old Fort Nelson in the spring of 1936: Sheffield and Couvoisier robbed the Hudson Bay Post of a bunch of fur and cached it. They were arrested at Kluchesi Lake on charges of trapping out of season. There wasn't enough evidence to charge them with the fur robbery until they were seen trying to retrieve some stolen fur from a cache the following year. They fled the country but were picked up in Sweet Grass, Montana, and brought back for trial in Prince George. Bert and Henry were then convicted of their crime, served a year in jail, and were back trapping in the Fort Nelson area the fall of '38." (information provided February 2003 by Shannon Soucie, local historian, Fort Nelson)

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