Total births
4,084
Boys' name · since 1995
Cillian
Since 1995, U.S. Social Security records show 4,084 babies named Cillian, peaking in 2024. See the year-by-year trend, decade totals, and state rankings below, sourced from federal birth data.
- #463
- among boys today
- 4,084
- born since 1995
- 2020s
- peak decade
- 97%
- more common than other boys
Yes -- Cillian is the #463 most popular boys' name in the U.S. today, with 4,084 recorded since 1995.
According to the U.S. Social Security Administration, Cillian has been recorded 4,084 times among boys since 1995, currently ranked #463 nationally and more common than 97% of boys, with its heaviest use in the 2020s. This profile covers year-by-year birth trends, decade totals, and state-level distribution, all derived directly from SSA birth-registration files spanning 1995 to 2025.
- #463 among boys today
- 4,084 born since 1995
- 2020s peak decade
- 97% more common than other boys
Data updated Jun 2026
The verdict
Cillian is currently the #463 boys' name in America, more common than 97% of boys - 4,084 born since 1995, peaking in the 2020s.
- #463
- among boys today
- 4,084
- born since 1995
- 2020s
- peak decade
- 97%
- more common than other boys
Cillian vs. every other boys name in current SSA rankings
#463
of 14,294 boys in use
More common than 97% of names given to boys today.
2020s
Peak decade
65% of everyone ever named Cillian was born in this single decade.
2024
Single peak year
668 babies were named Cillian in 2024 - its busiest year on record.
How Cillian compares
4,084 Top 14% higher than 86% of 14,294 names currently given to boys
Based on all-time total births among currently-ranked boys names. Names with fewer occurrences are grouped into wider buckets on the right.
Source U.S. Social Security Administration, national baby name data
How the numbers stack up
Cillian's all-time total is 11x the median boys name, and Liam still leads by a wide margin.
| Metric | Cillian | Median boys name (Elchonon) | #1 boys name (Liam) |
|---|---|---|---|
| All-time total births | 4,084 | 367 | 358,536 |
| Peak-year births | 668 | 23 | 22,252 |
Cillian's usage pattern, beyond the headline number
Cillian splits its recorded history at 2013: 90% of all births land in the more recent half, 10% in the earlier half, a lean toward present-day use rather than a passing spike. The single quietest year was 1995 (5 births) -- compare that against the 2024 peak of 668 for a sense of just how much the name's popularity has swung.
Cillian at a glance
Top 1,000 boys' namePeak year
2024
Current rank
#463
Active since
1995
Cillian popularity over time - boys
Annual U.S. births registered with the Social Security Administration · 1995–2025
- Peak year (2024)
- 668
- Annual births at peak, across 31 years of records
Cillian popularity over time - girls
6 total births recorded since 2024 (Cillian as girls' name)
Cillian by decade
Total births in each ten-year window, peak vs trough at a glance
2020s was Cillian's strongest decade.
2,662 babies received the name during that ten-year window, about 65% of all-time use.
Cillian births by decade
Total births in each ten-year window
- 1990s 10
1990s
10 births
- 2000s 208
2000s
208 births
- 2010s
2010s
1,204 births
- 2020s
2020s
2,662 births
What this shows Peak: 2020s at 2,662 births (65% of all-time use).
How Cillian compares to similarly-sized names
Years in SSA records vs. share of all-time use concentrated in the single peak year, among 15 boys names closest to Cillian's total volume
Cillian vs 15 similarly-sized boys names
Cillian by state
Where Cillian concentrates geographically, total births since 1995
| Rank | State | Visual share | Births | Share of total |
|---|---|---|---|---|
| #1 | New York | | 394 | 9.6% |
| #2 | California | | 386 | 9.5% |
| #3 | Texas | | 215 | 5.3% |
| #4 | Massachusetts | | 213 | 5.2% |
| #5 | Pennsylvania | | 195 | 4.8% |
| #6 | Illinois | | 191 | 4.7% |
| #7 | Florida | | 163 | 4.0% |
| #8 | Ohio | | 141 | 3.5% |
New York share of Cillian's total US births 9.6%
Even split
394 of 4,084 births nationwide. Compared to a flat distribution across 40 reporting states.
Cillian appears in 40 states. Explore state details →
Frequently Asked Questions
How popular is the name Cillian? ▼
Since 1995, Social Security records show 4,084 babies named Cillian. Today it holds rank #463 among boys. Its busiest year on record was 2024, with 668 births.
When was Cillian most popular? ▼
Cillian was most popular in the 2020s decade with 2,662 total births. The single peak year was 2024.
Where is Cillian most popular? ▼
The top states for the name Cillian are New York (394 births), California (386 births), Texas (215 births).
How long has the name Cillian been used? ▼
Records for Cillian go back to 1995, giving 31 years of history through 2025.
What names are similar to Cillian? ▼
Names with a similar sound or spelling include Cilas, Cilton, Cilian. These share a common prefix and are also used for boys.
What to do with Cillian's data
- New York records the most Cillians (394 births) -- see the full state breakdown if geography matters to your decision. New York names
- Weighing it against an alternative? Put two names side by side. Compare names
Figures reflect SSA-reported births only; see the methodology above for the privacy-suppression floor.
Keep exploring Cillian
Nearby Names Like Cillian
Names with a similar sound, spelling, or feel to Cillian
Compare Cillian side by side: Cillian vs Cilas Cillian vs Cilton Cillian vs Cilian
Related Names
Names with a similar popularity rank to Cillian
Data Sources
Data as of June 2026. Source: U.S. Social Security Administration (SSA).
According to the Social Security Administration, this profile draws directly from the agency's public-use baby-name files (updated June 2026). See our methodology for the full extraction, aggregation, and privacy-suppression rules.
Primary: Source: U.S. Social Security Administration, Baby Names from Social Security Card Applications, National Data, 1995–2025 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Cite this page
NameAlmanac Editorial. "Cillian: #463 Boys' Name - 4,084 Births, Peak 2024." NameAlmanac. Accessed via https://namealmanac.com/name/cillian. Licensed CC BY-SA 4.0.
Name Almanac is rendered directly from the Social Security Administration's public baby-name files, no number is typed in by an editor. This profile for Cillian draws directly on SSA national and state-level files, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.