Cacán (also Cacan, Kakán, Calchaquí, Chaka, Diaguita, and Kaka) is an extinct language that was spoken by the Diaguita and Calchaquí tribes in northern Argentina and Chile.
The language was documented by the Jesuit Alonso de Bárcena, but the manuscript is lost.
[1] Varieties classified by Loukotka (1968) as part of the Diaguit language group:[2] Mason (1950)[3] lists the Diaguita subgroups of Abaucan, Amaycha, Anchapa, Andalgalá, Anguinahao, Calchaquí, Casminchango, Coipe, Colalao, Famatina, Hualfina, Paquilin, Quilme, Tafí, Tocpo, Tucumán, Upingascha, and Yocabil.
Acalian, Catamarca, and Tamano are possibly also Diaguita subgroups according to Mason (1950).
Cacán vocabulary possibly exists today in toponyms and local surnames, but the etymologies are often dubious.