Vorbarra is a surname in the science fiction series the Vorkosigan Saga. It is the surname of the Emperors of Barrayar and the namesake of the planet.
The emperors of Barrayar have all carried the name Vorbarra. As of the last book in series time, the current Emperor was Emperor Gregor Vorbarra, son of the deceased Crown Prince Serg Vorbarra, and grandson of the former Emperor Emperor Ezar Vorbarra.
They are all descendants of Emperor Dorca the Just. Additionally, they are all related to Mad Emperor Yuri.