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Worldwide, Kilian (Kilian , Cillian , Килиан ) is a common male first name. The first name Kilian is habitual in Ireland, where it is quite a common male name, Andorra, and Austria, where it is quite a rare boy's name. Not in comparison with a country's population, it most frequently occurs in Germany, Tanzania, and France. Likewise, Kilian is the last name as well as the forename.
Kilian is also a name for the fictitious and mythical characters: Kilian , the operatic character in the opera Regina by Albert Lortzing; a clerk and Kilian , the operatic character in the opera Der Freischütz by Carl Maria von Weber; a wealthy peasant.