Guarayu is a Tupian language of Bolivia.The name Guarayu (Gwarayú) is a variant of Guarayo, which when used in a pejorative sense refers to several indigenous peoples in the area with the meaning of 'savage' or 'uncultured'. The origin of the names is Guara meaning "warrior", and yu "pale" (yellow or white). Compared to other Guarani peoples, the Gwarayú are lighter in colour, and bear a striking resemblance to another Guarani group found in Paraguay the Ache.