Little church or bright-headed
Derived from the Irish name Cillian, it is often associated with Saint Kilian, a 7th-century missionary. The name likely stems from the Gaelic word 'cill' meaning church, or 'ceallach' meaning strife or bright-headed.
US births per 5-year period, 1990–present (SSA data).
The character known as Captain Hook · Once Upon a Time
Professional basketball player
Irish missionary bishop
Professional wrestler
