The Nuu-chah-nulth also formerly referred to as the Nootka, Nutka, Aht, Nuuchahnulth or Tahkaht, are one of the Indigenous peoples of the Pacific Northwest Coast in Canada. The term Nuu-chah-nulth is used to describe fifteen related tribes whose traditional home is on the west coast of Vancouver Island.

In precontact and early post-contact times, the number of tribes was much greater, but the smallpox epidemics and other consequences of settler colonization resulted in the disappearance of some groups and the absorption of others into neighboring groups. The Nuu-chah-nulth are related to the Kwakwaka’wakw, the Haisla, and the Ditidaht First Nation. The Nuu-chah-nulth language belongs to the Wakashan family.

In 1979, the tribes of western Vancouver Island chose the term Nuu-chah-nulth (nuučaan̓ułz), meaning “all along the mountains and sea”), as a collective term of identification. 

Resource: https://en.wikipedia.org/wiki/Nuu-chah-nulth#Notes