Gregor Clegane's older brother is nicknamed The Hound.
Gregor Clegane . Introduced in 1996 's A Game of Thrones , Gregor is the older brother of Sandor Clegane , from the fictional kingdom of Westeros . Sandor Clegane , nicknamed The Hound , is a fictional character in the A Song of Ice and Fire series of fantasy novels by American author George R. R. Martin , and its television adaptation Game of Thrones .