The Galgo name is probably derived from the Latin "Canis Gallicus" or "Dog from Gaul". The Spanish word for all kinds of Greyhounds - including the Galgo - is "lebrel", which means "harrier" or "dog for chasing hares", since "liebre" is Spanish for hare. We can see the same derivative in the Italian "levriero" and the French "lévrier". The first written references to an ancient Celtic sighthound, the "vertragus", in the "Cynegeticus" of Flavius Arrianus (Arrian), Roman proconsul of the Spanish province of Baetica in the second century, may refer to the Galgo's antecedent.