Disappointment Inlet identified in the 1930 BC Gazetteer. Name changed to Lemmens Inlet 6 November 1934 on C.348, as recommended by Hydrographic Service.
Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office
Re-named by H.D. Parizeau, Hydrographic Service, after the Reverend John Nicholas Lemmens.