Earliest known reference to this name is 1912 (Walcott).
“One of the names proposed by Dr. Coleman for a prominent monadnock that is surrounded by ice, east of Mount Robson, is ‘ The Extinguisher ‘ and Mr. Wheeler has adopted the name on his map. I presume Dr. Coleman had in mind the conical extinguisher used in putting out candles in the olden times. It so happens that that particular mass of rock carries a very important bed of Cambro-Ordovician fossils, and will be referred to many times in the future in literature. It may be that I shall suggest a shorter and more euphonious name for it,” Walcott wrote to the Surveyor-General in 1912. His suggestion, “Billings Butte”, was not adopted.
- Walcott, Charles Doolittle [1850–1927]. “The monarch of the Canadian Rockies.” National Geographic Magazine, (1913):626. Internet Archive