The Sanpoil call themselves Nesilextcl'n, .n.selixtcl'n, probably meaning "Salish speaking," and N'pooh-le, a shortened form of the name.
The mother of Que Que Tas was a woman chief who met Lewis and Clark on the great plateau when they came through on the Pacific Northwest Expedition.
[3] The San Poil Tribe was incorporated into the Colville Confederation by executive order from the president of the United States after strong recommendation from the Indian agents noting the San Poil's relatively peaceful nature toward others (especially European settlers).
The Sanpoil are considered Interior Salish Native Americans, a designation that also includes the Okanagan, Sinixt, Lakes, Wenatchee, Nespelem, Spokan, Kalispel, Pend d'Oreilles, Coeur d'Alene, and Flathead peoples.
Without language preservation efforts, the dialect will be lost to the San Poil people and to the world.