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Cillian
BoyMeaning of Cillian: Irish: 'little church'
Cillian is a boy's name most strongly associated with Irish naming. It has 7 letters and 2 syllables, and it is one of today's most-chosen names — 521st most popular boys' name in the United States in 2025 and 177th in England & Wales.
US rank 2025
#521
595 babies in 2025
England & Wales 2024
#177
285 babies in 2024
US babies since 1880
4,090
First recorded 1995 · peak 2024
Trend
rising
Style: popular
Popularity over time
Gender split
100% boys · 0% girls, based on US, UK and international usage.
Origins & cultures
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