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In the world, Killian (Killian , Cillian , كيليان) is quite a common boy's first name. The forename Killian is habitual in Ireland, where it is quite a common masculine name, France, where it is quite a rare masculine name, and Belgium. Measured by absolute frequency, it is the most numerous in France, Ireland, and Tanzania. Also, Killian is the last name as well as the forename.
Killian is also a name for the fictitious and mythical characters: Killian Jones , the fictional character on Once Upon A Time.