Millcayac (Milykayak) was one of the Warpean languages.
[1] It was native to Cuyo in Argentina, but was displaced to Chile in the late 16th century.
Luis de Valdivia wrote a grammar, vocabulary and religious texts.
[2] The people became Mestizo and lost their language soon after.
[citation needed] This article related to the Indigenous languages of the Americas is a stub.