Cognomen 哈金 (Hacking 
, Harkin , Hagin 
) , in the world, is a common last name. The cognomen 哈金 is characteristic of Ireland, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Malta. Not in comparison with a country's population, it is commonest in the United Kingdom, the United States, and Ireland. Much less frequently, 哈金 is the forename as well as the last name.