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Last name Kilian (Kilian , Cillian , Килиан ) , worldwide, is a common surname. The family name Kilian is characteristic of Germany, where it is quite a common surname, Slovakia, where it is quite a rare surname, and South Africa. In absolute terms, this name is the most popular in Germany, South Africa, and the United States. Likewise, Kilian is the forename as well as the last name.