Surname كيلن (Kellan 
, Killen 
, كيلن) , in the entire world, is quite a common last name. The surname كيلن is characteristic of Ireland, where it is quite a rare surname, Australia, and Liberia. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Australia. Very seldom, كيلن is the forename as well as the last name.