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Boy's name · #507 in the US (2025) · 2020s wave
Cillian reached its best rank, #463, in 2024 and ranked #507 in 2025. About 4,100 boys have carried it since 1995.
See where Cillian is more common.
Appears in 2020-2025 birth records of 34 states. See the full state-by-state map on this page.
Cillian is especially popular in Ireland.
#9 in Ireland (2025) · #11 in N. Ireland (2025) · #100 in Scotland (2025) · #217 in England & Wales (2025) · #302 in New Zealand (2025) · #559 in Sweden (2025) · #1,040 in Netherlands (2025) · #1,362 in Austria (2025) · #1,814 in France (2025) · #468 in Canada (2024).
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 · Finnegan
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