Echachis Island adopted 6 November 1934 on C.340, not "Echachets" as spelled on British Admiralty Chart 584, 1863 et seq, and on BC Lands' map 2A, 1913.

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

An adaption of the Indian word E-cha-chist, a name by which the island and village have been known from time immemorial. Rev. A.J. Brabant furnished the following note on the subject: "I cannot give you the meaning of Echatchet as it has none and is no Indian word. The word E-cha-chist, very distinctly pronounced by the Indians, is derived from "echape", meaning elevated, and the affix "chist", which is descriptive of a sheet of water, sea, lake, etc. Hence the word E-cha-chist means 'elevated on the surface of the ocean' from the appearance of the locality when seen from a distance. Adopted on the chart by Carptain Richards when making a survey of the sound in 1861."

Source: Walbran, John T; British Columbia Coast Names, 1592-1906: their origin and history; Ottawa, 1909 (republished for the Vancouver Public Library by J.J. Douglas Ltd, Vancouver, 1971)