Cognomen 四金 (Sijin 
, 四金 ) , around the world, is quite a rare family name. The last name 四金 is characteristic of South Korea, where it is quite a rare surname, Hong Kong, where it is a rare surname, and United Arab Emirates. Not in comparison with a country's population, it is commonest in South Korea, China, and India. More prevalently, 四金 is the forename as well as the last name.