Cognomen Калаган (Callaghan 
, Калаган 
) , throughout the world, is a common family name. The cognomen Калаган is habitual in Ireland, where it is quite a common surname, Fiji, and Australia (explore the name in all countries). In absolute terms, this name is the most popular in the United Kingdom, the United States, and Ireland. Much less frequently, Калаган is the forename as well as the last name.