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“Irish, possibly meaning strife, or from church/monastery” — Irish origin
Boy's name · #507 in the US (2025) · 2020s
Cillian reached its best rank, #463, in 2024 and ranked #507 in 2025. About 4,100 boys have carried it since 1995.
Around the world: #9 in Ireland (2025) · #11 in N. Ireland (2025) · #100 in Scotland (2025).
Appears in 2020-2025 birth records of 34 states. See the full state-by-state map on this page.
Among 21 notable people named Cillian:
Sports figures appear 2.98× more often than among typical names — e.g. Cillian Sheridan, Irish footballer.
Similar names: Killian · Finnley · Kylo · Callen · Finnian · Cian
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