Waitaká language

Waitaká (Guaitacá, Goyatacá, Goytacaz) is an extinct language of Brazil, on the São Mateus River and near Cabo de São Tomé in the state of Rio de Janeiro. Not a word of it is known. Dialects, or at least tribal divisions, were Mopi, Yacorito, Wasu, and Miri. Loukotka (1968) suggests it may have been one of the Purian languages, though others consider this classification "circumstantial".

Although extinct, the Goytacaz language is traditionally associated with the origin of the toponym Macaé, which is believed to have derived from the term miquié, meaning "river of catfish" in that language.