I am aAguayo from Mexico, I have done research of the origen of the name, and is not not Basque, but Asturian. That is, west from the Basque countries. The name was give to one of three gothic brothers, that safe the chieftan Don Pelayo from drawining, as he felt from his horse in the Deva river on the Picos de España mountains, in circa 722 A.D. As he dives he said "Al agua yo voy para salvar a su majestad" Leaving him with the nickname as reconigtion of this act. Don Pelayo was putting off resistance on the Moorish advance in north Spain, with a meagger force of 30 to 40 men, which fought and live in caces in this mountains. And eventually defeated the enemy in a batlle in Covadonga, starting the process of the Spanish reconquest from the Moors. Don Fernando fought in circa 1220 in the siege of Baeza and Valencia (remember the Cid on a dead horse, that was the take of Valencia). Eventually the Aguayos expanded into Andalucia as they come with the forces of the reconquest. The main house in early time is in the provence of Cantabria, in Santander. The cot of arms is: 8 black couldrouns of water on the border,and a field of silver and azur waves. Any book of spanish geneology has it. The Aguayos in Mexico came in 1550, to settle in Parras , Coahuila. Were El Marques the San Miguel de Aguayo founded the town of Parras the la Fuente, and he was the main comercial producer of wine in the New Spain at that time. The original vineards of San Lorenzo are the oldest in the Americas . still producing under the Casa Madero Label. Brandy Madero and other products still carries a stam in the bottle that says, "Casa foundada in 1595".