it seems the word "Gaucho" comes from the "Quechua dialect", "huachu", which means "no parents". This word was used in the regions of La Plata, Argentina, Uruguay and even in Brazil to describe the riders of "La Pampa Argentina" that worked as cowboys.
Gauchos were nomads, tough and brave under dangerous situations.
Gaucho's came from the mix between Natives Indians and spanish invaders.
Gaucho's were excellent riders and their horses were their most valuable asset and their best friend. From the spanish invaders received horses and the guitar, from the Indians they received the poncho, the hear-band, the Mate and boleadoras.