Ha (하/河), sometimes romanized Hah is a common Korean Surname which means 'stream or river' in Sino-Korean Language, similar to Chinese Pinyin Hé. Based on 2000 Korean Republic Census which is provided by Statistics Korea (KOSTAT), there were 209,756 people in 65,965 families who bear the surname of Ha, making it the 34th most common name in Korean Republic. Ironically, this surname is different to interrogative Ha (何) but shares the same Hangul and Chinese Pinyin notations of 하 and Hé respectively.
According to the Great Genealogy of JinYang Ha Clan (진양하씨대동보/JinYang Ha-ssi Daedongbo), the clan traced its origins back to the Samhan Period or also known as Proto-Three Kingdoms in Korea. There are fifteen clans which are associated with the surname of Ha such as JinYang (Nowadays Jinju), Ganghwa, AnEum, Jeonju, Gangneung, Gyeongju, Hadong, Changnyeong, Miryang, Cheongju, Daejeon, DanGye, Nampyeong, Eunjin and Haman. However, the origins of three clans - JinYang, Ganghwa and AnEum are still unknown.
The 2000 South Korean census counted 192,869 members in 60,705 families of Jinju-JinYang Ha Clan (진주-진양 하씨/晋州-晋陽河氏), which is the most dominant among Ha clans. Their ancestral seat is located at the present-day Jinju City, Southern Gyeongsang Province. There are three progenitors of this clan which are Ha Gong-jin (하공진/河拱辰), Ha Jin (하진/河珍) and Ha Seong (하성/河成). With these three progenitors of Jinju-JinYang Ha Clan, this clan is divided into three smaller branches which are Sirang Branch (시랑공파/侍郞公波), Sajik Branch (사직공파/司直公波) and DanGye Branch (단계공파/丹溪公波) respectively.
Jinju-JinYang Ha clansmen played their vital role in the founding of Joseon Dynasty along with General Yi Seong-gye who later become King Taejo, deposing King GongYang - the Final King of Goryeo Dynasty in 1392. Ha Ryun (하륜/河崙) was the First Class Officer who responsible in the founding of Joseon Dynasty along with Jo Jun and King Taejo Yi Seong-gye. On the other hand, Ha Wi-ji (하위지/河緯地) was one of the Six Martyred Ministers (사육신/死六臣/Sayukshin) who loyal to Young King Danjong and opposed King Sejo who lead a coup to dethrone his young nephew.