Surname 卡索 (Caso 
, Castle , 卡索 
) , around the world, is a common last name. The cognomen 卡索 is characteristic of Northern Europe, particularly Aland Islands, where it is quite a common surname, Guernsey, and Isle of Man (explore the name in all countries). In absolute terms, it is commonest in the United States, the United Kingdom, and Italy. Very seldom, 卡索 is the forename as well as the last name.