Cognomen Киллиан (Killian 
, Cillian 
, Kilijan 
) , across the world, is a common surname. The family name Киллиан is habitual in Jersey, where it is quite a common surname, Ireland, where it is quite a rare surname, and the United States. Not in comparison with a country's population, this name is the most popular in the United States, Germany, and South Africa. Likewise, Киллиан is the forename as well as the last name.