Rousseau knew that this mountain was called “Mount Yapeitso” by the Nichicoun Amerindians (members of the Naskapi nation), “yapeits” meaning “male caribou”. He chose to preserve this name by attributing it to the lake which borders the north-eastern side of the mountain (this sheet of water is now called `` lake of the Ptarmigan ). In 1971, the Commission de géographie du Québec chose to rehabilitate the Amerindian name and formalize the name of the mountain in the form Mont Yapeitso .Commission de toponymie du Québec, Names and places of Quebec , 1994 and 1996 (printed illustrated dictionary), 1997 (CD-ROM)
