Cognomen Килиан (Kilian 
, Kylian 
, Килиан 
) , around the world, is a common family name. The cognomen Килиан is characteristic of Germany, where it is quite a common surname, Slovakia, where it is quite a rare surname, and South Africa. Measured by absolute frequency, the name is most common in Germany, South Africa, and the United States. Likewise, Килиан is the forename as well as the last name.