Having spent the best years of my life, 1938 - 1950, in Coeur d' Alene, I have always wondered where "Idaho" came from. The state has an explanation,that it was coined, came from a Kiowa word for Comanche or came from another Indian source. While researching in the records of Augusta County, Virginia I came across a pre-Lewis & Clark use of the name.
In a suit against Benjamin Faucett, Benjamin Salvage states that in 1796 he formed a partnership with Faucett to manufacture iron. He states that Faucett owned a furnace [foundry] in Rockingham County called "Idaho Furnace". So the name pre-dates the arrival of Lewis & Clark by almost 10 years.