Reminder that the capital of Idaho, Boise, is (apochraphally) named for the trees (les bois) that surround the Boise river. French made it quite a ways west, and definitely made it as far as Idaho.
The story goes Owyhee County is named after Hawaii. It's a county southwest of the Boise Area and home to the most beautiful wilderness I have ever seen. There is nothing like hiking mile after mile out there under the hot summer sun never seeing another living soul... But I digress. The story goes some Hawaiian goat herders entered the area to try their luck and were never to be seen again and hence the name. Owyhee = Hawaii
How true it is I do it know but it's what I've always been told.