Gilmour Bay was most likely named after the Gilmour Bay Lumber Baron family from Trenton.
If you have 66 minutes or so, it is very informative to watch the Youtube video “Lumber Baron- The Gilmour Years” at https://www.youtube.com/watch?v=JY0HfX5XciQ
The last 5 minutes or so has a really hilarious sketch called “the sawmill” -very chaplinesque.
We are most interested in finding out more about the Gilmour Bay lumbering operations.
Chandos lake appears in the map below, but is unnamed. Of course, before 1935 it was called “Loon Lake”.