What is the name of the native people who first discovered the lake monster the ogopogo?

The native people who first discovered the lake monster known as Ogopogo are the Syilx (Okanagan) people. They referred to the creature as "N'ha-a-itk," which translates to "lake demon" or "water spirit." The legend of Ogopogo has been part of their oral history for generations, highlighting the cultural significance of the creature in their traditions.