Rook is an English given name derived from the word 'rook', referring to a chess piece or black bird known for intelligence and adaptability. It was originally used as a surname in England since the 13th century, possibly deriving from a nickname for someone with dark hair or complexion, or an occupational name for a maker/seller of chess pieces. In recent years, Rook has gained popularity as a unisex given name due to its unique sound and association with intelligence and adaptability. Despite its rarity compared to common names, notable figures such as actress Rook Washington have carried this distinctive name throughout history.