Where did Idaho get its name?

Quoth the wiki:

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Idaho is the only state that was possibly named as the result of a hoax (the so-called "Idahoax") although this is disputed. In the early 1860s, when the United States Congress was considering organizing a new territory in the Rocky Mountains, eccentric lobbyist George M. Willing suggested the name "Idaho," which he claimed was derived from a Shoshone language term meaning "the sun comes from the mountains" or "gem of the mountains." Willing later claimed that he had made up the name himself.

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The full article is linked below.