Chamiss Bay adopted 3 June 1947 on C.3682 as spelled on BC Lands' map 2C, 1919, and in the 1930 BC Gazetteer (not Cha-miss Bay as had been spelled on British Admiralty Chart 583, 1865 et seq).
Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office
Sha:wiis was the name of the village here, with lots of fruit trees in the immediate area. (December 2010 advice from Ka:'yu:'k't'h' /Che:k:tles7et'h' First Nations.)