Killian or Cillian, as a given name, is an Anglicized version of the Irish name Cillín. ... The most likely meaning of the name is "little church", a reference to someone prayerful or spiritual, cill meaning "church" in Gaelic while the suffix "-ín" is used affectionately to indicate a 'pet' or diminutive status.
Cillian is baby boy name mainly popular in Christian religion and its main origin is . Cillian name meanings is War, strife. Other similar sounding names can be Kilian, Killian.