Where did the state of Wyoming get its name from?

The name, Wyoming, was used by Representative J. M. Ashley of Ohio who introduced the bill to Congress to provide a temporary government for the territory of Wyoming. The name, Wyoming, was made famous by the 1809 poem Gertrude of Wyoming by Thomas Campbell.
It derives from the Munsee name xwé:wamənk, meaning "at the big river flat", originally applied to the Wyoming Valley in Pennsylvania.