Priest River

Some 40 miles below the Priest Lake, the Priest River is a 68-mile (109 km) long tributary of the Pend Oreille River in the U.S. state of Idaho. It is part of the Columbia River basin, as the Pend Oreille River is a tributary of the Columbia River. The river's drainage basin is 980 square miles (2,500 km2) in area. It currently and historically supports bull and westslope cutthroat trout, which are the main focus of ongoing conservation efforts. These species of fish currently support native tribes in the area, as well as wildlife in general.
The Priest River takes its name from Priest Lake, which was named for a Roman Catholic priest, Father Pierre-Jean De Smet, S.J., who worked among the natives in the region. He initially tried to name the lake, "Roothaan Lake", after the Jesuit Superior General John Roothaan. Which would have made the river "Roothaan River" as well. The local natives rejected the unfamiliar European name, opting to name it after Priest Lake after Fr. de Smet himself. Other names for this river include the Kaniksu River, which means "Black Robe" in the Kalispel language, which refers to how the native peoples saw Jesuit Missionaries.

Source: Wikipedia https://en.wikipedia.org/wiki/Priest_River