Meaning
Cillian is a irish name meaning “Little church, bright-headed”.
History
Derived from the Irish cill (church) with an affectionate diminutive ending, Cillian honours a 7th-century missionary saint who travelled from Ireland to Franconia. Long a regional favourite, it has climbed sharply in the English-speaking world in recent years.
Popularity
Ranked #46 in 2026 · up 374 places since 1996
Lower is more popular. Ranks are illustrative directory data.