text: Population The Mandan population was 3,600 in the early 18th century. It is estimated to have been 10,000–15,000 before European encounter. Decimated by a widespread smallpox epidemic in 1781, the people had to abandon several villages, and remnants of the Hidatsa also gathered with them in a reduced number of villages. In 1836, there were more than 1,600 full-blood Mandans but, following another smallpox epidemic in 1836–37, this number was estimated to have dropped to 125 by 1838.
  In the 20th century, the people began to recover. In the 1990s, 6,000 people were enrolled in the Three Affiliated Tribes. In the 2010 Census, 1,171 people reported Mandan ancestry. Some 365 of them identified as full-bloods, and 806 had partial Mandan ancestry.
  Etymology
  The English name Mandan is derived from the French-Canadian explorer Pierre Gaultier, Sieur de la Verendrye, who in 1738 heard it as Mantannes from his Assiniboine guides, which call the Mandan Mayádąna. He had previously heard the earth lodge peoples referred to by the Cree as Ouachipouennes, "the Sioux who go underground". The Assiniboine are Siouan speakers. Nearby Siouan speakers had exonyms similar to Mantannes in their languages, for instance, Teton Miwáthaŋni or Miwátąni, Yanktonai Miwátani, Yankton Mawátani or Mąwátanį, Dakota Mawátąna or Mawátadą, etc.
  The Mandan have used differing autonyms to refer to themselves: Numakaki (Nųmą́khų́·ki) (or Rųwą́ʔka·ki) ("many men, people") was inclusive and not limited to a specific village or band. This name was used before the smallpox epidemic of 1837–1838. Nueta (Nų́ʔetaa), the name used after this epidemic ("ourselves, our people") was originally the name of Mandan villagers living on the west bank of the Missouri River.