Whadjuk, also called Wadjuk, Whajook, Wajuk and Wadjug, is the name of the Noongar dialectical group inhabiting the Western Australian region of the Perth bioregion of the Swan Coastal Plain, and extending below Walyunga into the surrounding Jarrah Forests according to Norman Tindale. The etymology is unknown but it has been suggested that it may come from Wirtj, meaning "those who went before" (i.e. ancestral ones), and implied that Tindale's informants considered all Whadjuk people were dead.