Adopted 6 October 1936 on Geological Survey sheet 422A, Hope, as labelled on BC Lands' map 2B, 1914. See Cheam Slough for origin information.
Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office
Spelled "Mount She-am" on roads & trails plan 12T1 (date/title not cited) - a closer approximation of the Halkomelem pronunciation for the lowland area from which this name is borrowed.
Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office