Delkatla Inlet adopted 6 February 1948 on Chart #3805, as identified in the 1930 BC Gazetteer. Spelling changed 7January 2022 to Dal Ḵáahlii on 103K/1 as recommended by The Council of the Haida Nation and supported by North Coast Regional District, Archipelago Search and Rescue, Royal Canadian Marine Search and Rescue, and the Village of Masset.

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

Dal Ḵáahliii is the ancestral X̱aad Kíl name for this inlet (Advice from The Council of the Haida Nation, 2020).

Source: included with note

Labelled "Delkatla Creek" on Dominion Chart 3713, 1908, where Creek is an old term for Inlet. Spelled "Delcatla Inlet" on BC map 3L, 1919. "Delkatla Inlet (not Delcatla)" identified in the 1930 BC Gazetteer.

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

Hydrographic Service Sailing Directions identify this as an inlet, and describe it as a "drying basin", although it is well-known locally as Delkatla Slough.

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

The gazetted name for the big slough which...extends inland behind the old villge of Ka-Yung and New Masset. The name Delkatla is from an old Haida description meaning "water drifting in to the inside." The local name given to the grassland at the head of the slough is Delkatla Flats. Charles Harrison established a farm on the east side of the flats in the 1880s - the first farm on the Charlottes.

Source: Dalzell, Kathleen E; Queen Charlotte Islands - Book 2: of places and names; Prince Rupert: Cove Press, 1973