 The Oglala are a federally recognized tribe whose official title is the Oglala Sioux Tribe (previously called the Oglala Sioux Tribe of the Pine Ridge Reservation, South Dakota).However, many Oglala reject the term "Sioux" due to the hypothesis (among other possible theories) that its origin may be a derogatory word meaning "snake" in the language of the Ojibwe, who were among the historical enemies of the Lakota.They are also known as Oglala Lakota.