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Cillian

“Irish, possibly meaning strife, or from church/monastery” — Irish origin

Boy's name · #507 in the US (2025) · 2020s

Cillian has appeared in US records since 1995 — best rank #463 (2024) · 4,084 babies named Cillian all-time · 1 in 2,900 boys born in 2025.

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.

Famous Cillians

• Cillian Murphy — Irish actor (born 1976)
• Cillian Sheridan — Irish footballer
• Cillian Vallely — Irish musician
• Cillian O'Connor — Gaelic footballer
• Cillian Buckley — Irish hurler

What Cillians become

Among 21 notable people named Cillian:

Athletes appear 2.98× more often than among typical names — e.g. Cillian Sheridan, Irish footballer.

Browse more boy names — popularity, trends and eras for 5,700+ American names, free.

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