Cognomen カルキン (Calkin 
, Culkin 
, カルキン) , all over the world, is quite a rare last name. The last name カルキン is characteristic of Isle of Man, where it is quite a rare surname, Ireland, and New Zealand. Not in comparison with a country's population, it most frequently occurs in the United States, the United Kingdom, and Ireland. Much less frequently, カルキン is the forename as well as the last name.