Adopted 31 March 1924 on 94D/15 as listed in 1915 and 1924 Gazetteers and as labeled on Reference Map 1H "B.C., Northern" (1917). May have previously been labeled as Thudade or Thutage Lake (maps/dates not cited). In lieu of original paperwork this name was reconfirmed 12 January 1939. The lake is described by Frank Swannell (B.C.L.S.) in 1931-32 survey report.

Source: BC place name cards & correspondence, and/or research by BC Chief Geographer & Geographical Names Office staff.

Adapted from the Sekani name for the lake, Tu Dadi (Guzagi K'úgé, published by Kaska Tribal Council, Watson Lake, 1997). Origin/meaning not provided.

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

"Thutade" is recorded as being an anglicization of an Indigenous word meaning "long narrow lake." According to Spatsizi and Tatlatui Wilderness Parks, it it is pronounced "Too-ta-dy" (p. 153)

Source: BC place name cards & correspondence, and/or research by BC Chief Geographer & Geographical Names Office staff.