Carballo's last name is of occupational origin and gave individuals who were knights or knights serving.

Some variations of this surname are: Caballero, Caballeros, Caballer, Caballe, Caballeria, Caballo, Caballos, de Caballos, Cavallo, Cavallos, de Cavallos, Cavallon, de Cavallon, Cavallero, Cavalleria and others.

First found in Castilla, an important kingdom of medieval Spain.