Mount Elsay adopted 4 August 1955 on C.3435, as identified on 1926 topographic map by A.J. Campbell, BCLS, and on BC map 5C, Howe Sound, 1929 (file H.1.29).

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

First recorded ascent: 1923 BC Mountaineering Club party of 20. Named in association with Elsay Lake.

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

"First climbed in 1909, by a party from the Vancouver Mountaineering Club (now known as the BC Mountaineering Club), while another party from the same group simultaneously climbed the mountain just to the north. These two mountains were unnamed at the time, so they decided to name this one "Mount Jarrett" after the first secretary of the club, Mr. George Jarrett, and the other "Mount Bishop" after the club's first president, Mr. Joseph Charles Bishop. [see Mount Bishop] Mr. Jarrett was a young South African war veteran, who arrived in Vancouver with fellow war veteran Mr H.B. Rowe." (compiled by David Grantham, great grandson of Fred Mills, from Fred Mills' memoirs and the Daily Province newspaper 1909, and provided to the BC Geographical Names office in April 2006.) [no explanation why the name "Mount Jarrett" didn't stick and was eventually replaced with "Mount Elsay" nor an explanation for contradictory info about year of first ascent.]

Source: included with note