Boss Mountain identified in the 1930 BC Gazetteer, in association with Boss Triangulation Station here. Boss Mountain approved by Geographic Board of Canada 28 April 1936 on map 3G. Name changed to "Takomkane Mountain" 1 September 1960 on 93A, the local name according to 1957 advice from R.D. McCaw, BCLS, and as labelled on his 1936 map 93A/2, and on BC Lands' map 3G, 1949 & 1957. Name further changed to Big Timothy Mountain 2 March 1961 on 93A, to reflect entrenched and preferred local usage. (letters August 1957, file B.1.37; and December 1960 & April 1964 letters, file Q.1.60)

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

Labelled "Takomkane Mtn (Big Timothy)" on R.D. McCaw's 1936 map 93A/2, file B.1.37.
"The local name [for Boss Mtn] is Big Timothy or Takomkane." (8 December 1937 letter from Major E.B.Hart, file B.1.37)
"The Indian name for Big Timothy Mtn...is Ta-kom-kane. That is simple and easily spelled & pronounced, and would be recognized by all the Indians here, and would soon be learned by the whites." (January 1938 letter from Major E.B.Hart; LI 1266432, file 826197 / 01863).

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