Surname 鸿金 (Hongjin 
, 鸿金 ) , in all the world, is a rare family name. The last name 鸿金 is characteristic of South Korea, where it is a rare surname, China, where it is a very rare surname, and Chile, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in China, South Korea, and the United States. More prevalently, 鸿金 is the forename as well as the last name.