Vietnam was called Dai Co Viet during the Dinh Dynasty in the 11th century.

500 years later, Thanh Ton of the Le Dynasty named the nation Dai Viet.

In 1174, during the reign of Anh Tong of the Ly Dynasty, the Chinese Empire officially let his nation be called Annam.
The Ly Vietnam was divided into five circuits.

In 1802, Emperor Gia Long of the Nguyen requested the Qing Empire to allow his country to be known as Nam Viet.

The next year, the Emperor of China gave Gia Long the title "Grand King of Vietnam," hence the modern name.

In 1838, during the Nguyen Dynasty, the nation's name was changed temporarily to Dai Nam.

Vietnam had been divided into the Three Bo, which included the Northern Bo (Bac Ky) (since the French Occupation, Tonkin),
Central Bo (Trung Ky) (Annam),
and Southern Bo (Viet: Nam Ky)(Cochin China).