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By Clare Green · Sep 2026

KILL-ee-an

Cillian

OriginIrish
Meaning"war strife or church"
GenderBoy
Also a girl's nameShow me Cillian as a girl's name
US Rank#507

Top 1000

About Cillian

Variation of Killian

Pronounced KILL-ee-an.

As of September 2026, Cillian ranked #507 in US births in 2025 SSA, peaked at #463 in 2024, Nameberry popularity #129.

Popularity & trends

US popularity — history
US rank, lower is more popular · SSA data 2014–2025
Actual · SSA
#500#1,000#1,500TOP 1000'14'16'18'20'22'24
20142025
18802025
Data table
YearUS rankBirthsPer million
2014#1,7338745.3
2015#1,41812163.1
2016#1,10717793.3
2017#1,12617091.8
2018#1,051193106.3
2019#1,077186103.7
2020#957228132.1
2021#749340194.3
2022#737352201.6
2023#594476278.3
2024#463668387.7
2025#507595348.3
Popularity history from more than a century of Social Security Administration birth records. Years without a line are years the name fell below the published records.

See the Berry Trend for All Names

World rankings

#9🇮🇪 Ireland#100🏴󠁧󠁢󠁳󠁣󠁴󠁿 Scotland#129🫐 Nameberry#217🏴󠁧󠁢󠁥󠁮󠁧󠁿 England#507🇺🇸 US#736🔮 Future

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Famous Cillians

  • Cillian Murphy

    Irish actor

  • Cillian Sheridan

    Irish footballer

  • Cillian Vallely

    Irish musician of band Lunasa

Cillian in pop culture

  • Cillian Boyd

    character in the Chaos Walking series by Patrick Ness

Cillian in blog posts

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