What is Auron's last name in Final Fantasy 10?

Auron was one of the guardians of Lord Braska in the past he had died during an assault on Yunalesca however he remained roaming about to fulfill the wish of his friend Jecht to help out his son Tidus from Sin which Jecht would soon transform to later on. Auron succesfully does this later on in the game and then Yuna sends his spirit onward.