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The lake name Ka-shesheb-agam-ag is a First Nations term that may mean 'where there are-ducks-lake-place', thus 'Lake of Many Ducks'; compare Ojibwe jishib 'duck'; the following are spurious (Carl Masthay, St. Louis, 2009): Kah-Lake, She-Many, Bog-Ducks,a-and, Mog or Maug-Loons, therefore Lake of Many Many Ducks and Loons (researched by Ken Little). Other people claim that it means Lake of Many Islands or "Lake of Healing Waters".
The west side of Kahse Lake is shallow while the east side is deep. Both areas have many shallow rock hazards with no marker buoys. A public beach, boating docks and a boat launch are located off North Kahshe Lake Road.
Kahshe Lake has been featured on fishing shows and in a Tim Hortons television commercial. Residents have been staging the Kahshe Lake regatta, for over fifty years. Lake Kahshe also has barn dances, a Labour Day concert, and the Rockhaven Inn craft sale. As well as the bi-yearly Muskoka Seaflea Fleafest event.
- "Kahshe Lake Ratepayers Association (KLRA) - The Kahshe Lake Regatta". www.kahshelake.ca. Retrieved 2020-03-07.