 According to Daniel Granada, "Chui" was also the name the Indians gave a yellow-breasted bird, native and common in the marshes of the area.According to Tancredo Blotta, "chuy" is a compound word which should be translated as "river of brown water".The Brazilian historian Péricles Azambuja alludes to a rumor that the word (originally "Chyu") would have been brought by former tribes who migrated from the Andes.