for rivers Aroostook County, Maine: Aroostook is named for a Native American word meaning beautiful river. Canyon County, Idaho: Canyon is named after either the Boise River or Snake River canyons. Coös County, New Hampshire: Coös is named for a Native American word meaning crooked, in reference to a bend in the Connecticut River. Crow Wing County, Minnesota: Crow Wing is named after an island shaped like a raven's wing at the junction of the Crow Wing River and Mississippi River. Huerfano County, Colorado: Huerfano is named for Huerfano Butte, as was the Huerfano River. Huerfano is orphan in Spanish. Merced County, California: Merced is named for the Spanish word for mercy, and was named by Spanish explorers in gratitude for water of the Merced River, which was found after a dry 40-mile trek. Muskingum County, Ohio: Muskingum is a Delaware word meaning by the river side. Riverside County, California: Riverside is named for the city of Riverside, the county seat, which in turn was named for its location beside the Santa Ana River. Sagadahoc County, Maine: Sagadahoc is named for a Native American word meaning mouth of big river. Twin Falls County, Idaho: Twin Falls is named after the double falls along the Snake River. Yellowstone County, Montana: Yellowstone is named for the yellow rocks found along what is now known as the Yellowstone River. See also County (United States) Lists of U.S. county name etymologies Rivers