Considered one of the most prominent clans since the Gija period of the ancient Gojoseon Kingdom, the clan provided the Joseon dynasty with the biggest number of generals, including Han Myeong-hoe, who was one Joseon's greatest generals and the father of Queen Jangsun (first wife of Yejong) and Queen Gonghye (first wife of Seongjong).
There are two Korean surnames which are believed to be related and share common ancestry and origin with the Cheongju Han.
According to genealogical records, Gijun, the last King of Gojoseon, is believed to have had three sons, U-Pyeong (우평), U-Seong (우성) and U-Ryang (우량).
Gija and his descendants were also believed to have the surname Han (韓), as Jun, the last King of Gojoseon and a descendant of Gija, who, after fleeing from Wiman, claimed himself as the King of Han (한왕; 韓王), when he founded Mahan (part of the Samhan).
With this it shows that the surname Han may have existed since the time of Gojoseon and establishes the Han clan (韓) as the oldest surname in Korea (dating back to around 5000 years ago) and as the rulers Gojoseon and Mahan.