The Wichí are an indigenous people of South America. They are a large group of tribes ranging about the headwaters of the Bermejo River and the Pilcomayo River, in Argentina and Bolivia.
This ethnic group was named by the English settlers and is still widely known as Mataco. The etymology of the term is obscure but in several sources, it is cited that the Wichí find the term derogatory. Among the group exists a folk etymology for this term, which relates it to the Spanish verb matar, to kill. Thus their preferred name, their own word for themselves, is Wichí, pronounced wiˈci, and their language, Wichí Lhamtés [wiˈci ɬamˈtes].
There is a pronunciation variant in some areas of Bolivia, [wikɣiʡ], where the self-denomination of the group is Weenhayek wichi, translated by Alvarsson (1988) as "the different people" (pl. Weenhayey). Weenhayey informers of Alvarsson state that the old name was Olhamelh ([oɬameɬ]), meaning simply us. The subgroups within Wichí have been identified and received different names in literature: Nocten or Octenay in Bolivia, Véjos or (perhaps more properly) Wejwus or Wehwos for the Western subgroup(s), and Güisnay for the Eastern subgroups of Argentina. The latter corresponds to Tewoq-lhelej, "the river people".
At present, a number of Wichí groups can be found in Argentina and Bolivia, distributed as follows:
Argentina:
18 groups in the north-west of Chaco, about 180 km north-west of the town of Castelli.
Many communities in Formosa, departments of Bermejo (15 communities), Matacos (10 communities), Patiño (7 communities) and Ramón Lista (33 communities).
Other communities are located in Salta, departments of San Martín (21 communities), Rivadavia (57 communities, some of them with just a few individuals), Orán, Metán (2 communities) and Anta (3 communities), being the latter three more isolated; and in Jujuy, departments of Santa Bárbara, San Pedro and Ledesma.
Bolivia: Gran Chaco province, Tarija Department, on the Pilcomayo River, 14 communities living in the area from (and including) the town of Villa Montes up to D'Orbigny, in the Argentine border.