Adopted 2 September 1930 on Garibaldi Park map, as labelled on BC Lalnds' map 3K, 1920 (file G.1.30).
Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office
The L'íl'wat name for Cheakamus Lake is Nsqwítsu. L'íl'wat People come here to pick bog cranberries. (December 2011 from: Cultural Journey Sea-to-Sky Corridor website, Squamish and Lil'wat First Nations)