Unisex name · since 1978
Reilly
Since 1978, U.S. Social Security records show 5,528 babies named Reilly, peaking in 1998. See the year-by-year trend, decade totals, and state rankings below, sourced from federal birth data.
- #2,410 of 72,339
- all-time among girls
- #2,844 of 17,297
- 2025 SSA year
- 5,528
- born since 1978
- 2000s
- peak decade
Yes -- Reilly is the #2844 most popular unisex name in the U.S. today, with 5,528 recorded since 1978.
Social Security Administration records show Reilly recorded 5,528 times among girls since 1978, holding rank #2844 nationally today, ahead of 84% of girls, peaking in the 2000s. This profile derives year-by-year birth trends, decade totals, and state-level distribution directly from SSA birth-registration files spanning 1978 to 2025.
- #2,410 of 72,339 all-time among girls
- #2,844 of 17,297 2025 SSA year
- 5,528 born since 1978
- 2000s peak decade
Data updated Aug 2026
The verdict
According to the U.S. Social Security Administration, Reilly ranks #2,410 of 72,339 girls' names by all-time recorded births (highest first) and #2,844 of 17,297 among girls' names in 2025. 5,528 born since 1978, peaking in the 2000s.
- #2,410 of 72,339
- all-time among girls
- #2,844 of 17,297
- 2025 SSA year
- 5,528
- born since 1978
- 2000s
- peak decade
Reilly's 5,528 recorded births place it above 96.66% of the 72,339 girls names in the full SSA archive.
34 jurisdictions carry state-level records, led by California.
How Reilly compares
5,528 Top 13% higher than 87% of 17,297 names currently given to girls
Based on all-time total births among currently-ranked girls 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
Reilly's all-time total is 15x the median girls name, and Olivia still leads by a wide margin.
| Metric | Reilly | Median girls name (Kyann) | #1 girls name (Olivia) |
|---|---|---|---|
| All-time total births | 5,528 | 376 | 567,345 |
| Peak-year births | 379 | 21 | 19,840 |
Reilly's usage pattern, beyond the headline number
Divide Reilly's SSA record in two at 2002 and the more recent half accounts for 58% of all births, the earlier half the remaining 42%, a genuinely balanced usage pattern. Its calmest year was 1981, with only 5 births recorded -- set against the 1998 peak of 379, that's the full swing in one name's fortunes.
Reilly popularity over time - girls
Annual U.S. births registered with the Social Security Administration · 1978–2025
- Peak year (1998)
- 379
- Annual births at peak, across 48 years of records
Reilly popularity over time - boys
4,560 total births recorded since 1953 (Reilly as boys' name)
Reilly by decade
2000s is the heaviest window (2,437 births, 44% of the file).
2000s was Reilly's strongest decade.
2,437 babies received the name during that ten-year window, about 44% of all-time use.
Reilly births by decade
Total births in each ten-year window
- 1970s 6
1970s
6 births
- 1980s 108
1980s
108 births
- 1990s
1990s
1,596 births
- 2000s
2000s
2,437 births
- 2010s
2010s
996 births
- 2020s 385
2020s
385 births
What this shows Peak: 2000s at 2,437 births (44% of all-time use).
How Reilly compares to similarly-sized names
Years in SSA records vs. share of all-time use concentrated in the single peak year, among 15 girls names closest to Reilly's total volume
Reilly by state
Where Reilly concentrates geographically, total births since 1978
| Rank | State | Visual share | Births | Share of total |
|---|---|---|---|---|
| #1 | California | | 423 | 7.7% |
| #2 | New York | | 412 | 7.5% |
| #3 | Pennsylvania | | 359 | 6.5% |
| #4 | Illinois | | 285 | 5.2% |
| #5 | New Jersey | | 240 | 4.3% |
| #6 | Ohio | | 208 | 3.8% |
| #7 | Texas | | 193 | 3.5% |
| #8 | Florida | | 180 | 3.3% |
423 of 5,528 births nationwide. Compared to a flat distribution across 34 reporting states.
Reilly appears in 34 states. Explore state details →
Frequently Asked Questions
How popular is the name Reilly? ▼
Where does Reilly sit in the SSA name archive? ▼
When was Reilly most popular? ▼
Where is Reilly most popular? ▼
Is Reilly a unisex name? ▼
How long has the name Reilly been used? ▼
What names are similar to Reilly? ▼
What to do with Reilly's data
- Reilly's decade-level peak was the 2000s (2,437 total births); usage has since declined to 385 in the 2020s -- if you're weighing a "classic revival" angle, the trend line argues against it.
- California records the most Reillys (423 births) -- see the full state breakdown if geography matters to your decision. California names
Figures reflect SSA-reported births only; see the methodology above for the privacy-suppression floor.
Keep exploring Reilly
Nearby Names Like Reilly
Names with a similar sound, spelling, or feel to Reilly
Compare Reilly side by side: Reilly vs Reina Reilly vs Reign Reilly vs Reita
Related Names
Names with a similar popularity rank to Reilly
Nationwide names with similar peak year or record span
Two nationwide peer axes for Reilly: closest SSA peak year, and closest first→latest record span. Distinct from the spelling and current-rank neighborhoods above.
Similar peak year (~1998)
Similar record span (~47 yrs)
Peak year is the single SSA year with the most births for that name; record span is first-to-latest year in the national files, not a recommendation or shared origin claim.
Data Sources
Data as of August 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, 1978–2025 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
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 Reilly 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 August 2026.