Adopted 12 December 1939 on 92SE, as labelled on British Admiralty Charts, and on BC Lands' map 2A, 1913 et seq.

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

Named by Captain Richards, RN, when in command of HM surveying vessel Plumper, on this coast 1857-61.

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)

NOTE: The ship's log was kept by J.T. Gowlland, who served aboard HM surveying vessel Plumper as Second Master; the entries from 10 November 1858 to ?? December 1860 are on microfilm at the Provincial Archives (Roll 447A). A journal was also kept by R.C. Mayne, who served aboard the Plumper as Lieutenant; his (original?) manuscript, containing entries from 17 February 1857 to 31 December 1860, is held at the Provincial Archives (accession # E/B/M45), also a typed transcript (E/B/M45A)

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

Plumper Sound connects Navy Channel and Boundary Pass; the southerly extent is a line drawn between Blunden Islet and Taylor Point; northern extent is a line drawn from St. John Point to Colston Cove headland.

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