Baby Names US
Unisex name ★ peaked 1997

Reilly

Meaning descendants of Raghallach Gender Unisex · 55% girls Rank 2025 #2,855 Trend ↓ Falling 23%

From Irish Ó Raghallaigh, a surname meaning "descendants of Raghallach".

Rank 2025
#2,855
among girls · ↓141 vs 2024
Babies in 2025
108
named Reilly · -2% vs 2024
How common
1 in 26,788
girls born in 2025
Peak year
1997
543 babies
All-time total
10,088
#2,410 all-time among girls
First recorded
1953
in Social Security records

Reilly popularity over time

10,088 babies have been named Reilly since 1953, according to official Social Security records. Switch measure to see births per year or the yearly rank.

Measure
Births per 1,000 babies of that sex, comparable across eras
0.060.130.190.2518801900192019401960198020002020GirlsBoys
GirlsBoys

By decade. Change compares yearly averages, so the current partial decade is on equal footing. Best rank is the name's best yearly rank within the decade.

Decade Girls Boys Total Per year Change Best rank
1880s – – – – – –
1890s – – – – – –
1900s – – – – – –
1910s – – – – – –
1920s – – – – – –
1930s – – – – – –
1940s – – – – – –
1950s – 13 13 1 – –
1960s – – – – – –
1970s 6 18 24 2 – #9,423
1980s 108 206 314 31 +1208% #4,477
1990s 1,596 1,032 2,628 263 +737% #623
2000s 2,437 1,916 4,353 435 +66% #738
2010s 996 1,059 2,055 206 -53% #1,569
2020s (to 2025) 385 316 701 117 -43% #2,236

Where Reilly is heading

A five-year projection from the recent trend in births per 1,000 girls (damped so it flattens over time), converted to babies at today's birth totals. The implied rank places that projection in the 2025 field. A projection, not a promise: real trends bend.

Year Projected babies Per 1,000 girls Implied rank
2026 58 0.04 outside top 500
2027 56 0.04 outside top 500
2028 55 0.03 outside top 500
2029 54 0.03 outside top 500
2030 53 0.03 outside top 500

Where Reilly is most popular

Girls named Reilly per 1,000 girls born in each state, 2021–2025. National average: 0.037 per 1,000. Strongest in New York, Massachusetts, and Illinois.

Vs national average
well below below near national above well above no data

All 50 states and DC, sorted by rate. Counts are girls named Reilly born 2021–2025; the per-1,000 rate makes states of different sizes comparable, and the last column shows each state against the national average.

State Girls 2021–2025 Per 1,000 vs national
New York 36 0.091 +143%
Massachusetts 8 0.066 +77%
Illinois 14 0.061 +63%
Pennsylvania 11 0.047 +24%
New Jersey 6 0.033 -11%
Ohio 6 0.025 -33%
California 11 0.013 -65%
Florida 5 0.012 -69%
Alaska – – –
Alabama – – –
Arkansas – – –
Arizona – – –
Colorado – – –
Connecticut – – –
District of Columbia – – –
Delaware – – –
Georgia – – –
Hawaii – – –
Iowa – – –
Idaho – – –
Indiana – – –
Kansas – – –
Kentucky – – –
Louisiana – – –
Maryland – – –
Maine – – –
Michigan – – –
Minnesota – – –
Missouri – – –
Mississippi – – –
Montana – – –
North Carolina – – –
North Dakota – – –
Nebraska – – –
New Hampshire – – –
New Mexico – – –
Nevada – – –
Oklahoma – – –
Oregon – – –
Rhode Island – – –
South Carolina – – –
South Dakota – – –
Tennessee – – –
Texas – – –
Utah – – –
Virginia – – –
Vermont – – –
Washington – – –
Wisconsin – – –
West Virginia – – –
Wyoming – – –

State counts come from the Social Security Administration's state files, which omit any state-year with fewer than five babies of a name, so small states can undercount slightly.

The story of Reilly

Reilly is rare for girls in the United States, ranked #2,855 in 2025 with 60 babies given the name. It is currently declining compared with a decade ago.

Since 1953, 10,088 American babies have been named Reilly, about 55% girls and 45% boys, making it a genuinely unisex name. Its peak came in 1997, when 543 newborns received the name, the signature sound of the 1990s.

The chart above shows the full history: the popularity view (births per 1,000 babies) is the honest comparison across generations, since total US births have changed enormously since 1880. Switch to the rank view to see where Reilly stood among all girls' names in any year, or use the compare tool to plot it against other names.

How old are people named Reilly?

The median living Reilly is about 21 years old; half are between 15 and 26. An estimated 10,000 people named Reilly are alive in the United States today.

median 21 020406080100

Estimated from births per year and Social Security period life tables; an approximation of the living age distribution, by age in years.

Reilly year by year

Every year since 2001, and five-year steps back to 1880. Rank is within each sex.

Year Girls Girls rank Boys Boys rank
2025 60 #2,855 48 #2,708
2024 64 #2,714 46 #2,822
2023 50 #3,261 56 #2,429
2022 65 #2,678 55 #2,509
2021 65 #2,666 60 #2,319
2020 81 #2,236 51 #2,538
2019 81 #2,267 72 #2,037
2018 72 #2,472 71 #2,039
2017 75 #2,422 64 #2,151
2016 99 #2,013 95 #1,671
2015 90 #2,137 84 #1,800
2014 89 #2,152 104 #1,546
2013 103 #1,936 114 #1,457
2012 108 #1,870 149 #1,205
2011 140 #1,569 143 #1,226
2010 139 #1,581 163 #1,142
2009 163 #1,438 172 #1,084
2008 193 #1,293 210 #958
2007 199 #1,246 218 #911
2006 178 #1,321 174 #1,046
2005 241 #1,014 178 #978
2004 268 #907 168 #990
2003 276 #876 196 #875
2002 305 #776 204 #823
2001 325 #738 202 #817
2000 289 #795 194 #827
1995 84 #1,744 95 #1,189
1990 52 #2,392 43 #1,834
1985 7 #9,037 39 #1,640
1980 8 #7,949 5 #7,058
1975 – – 5 #6,128
1970 – – – –
1965 – – – –
1960 – – – –
1955 – – – –
1950 – – – –
1945 – – – –
1940 – – – –
1935 – – – –
1930 – – – –
1925 – – – –
1920 – – – –
1915 – – – –
1910 – – – –
1905 – – – –
1900 – – – –
1895 – – – –
1890 – – – –
1885 – – – –
1880 – – – –

Famous people named Reilly

The most globally famous bearers of the name, ranked by fame across Wikipedia editions (Pantheon project, MIT).

  1. 1 Reilly Opelka Reilly Opelka American tennis player (born 1997) Contemporary

Portraits from Wikipedia (Wikimedia Commons).

Frequently asked questions

Quick answers about Reilly, drawn from the same Social Security data as the charts above.

How old is the average Reilly?

The median living Reilly is about 21 years old. Half of all living Reillys are between 15 and 26 years old.

How many people named Reilly are alive today?

An estimated 10,000 people named Reilly are alive in the United States, based on 10,088 recorded births and Social Security life tables.

What does the name Reilly mean?

From Irish Ó Raghallaigh, a surname meaning "descendants of Raghallach".

How popular is the name Reilly in 2025?

Reilly ranked #2,855 among girls' names in the United States in 2025, with 60 babies given the name, according to Social Security Administration data.

How many people are named Reilly?

10,088 babies have been named Reilly in the United States since 1953, based on Social Security card applications.

When was the name Reilly most popular?

Reilly peaked in 1997, when 543 newborns received the name.

Is Reilly a boy or girl name?

Reilly is used for both: about 55% of babies named Reilly have been girls and 45% boys.

Is the name Reilly rising or falling?

Reilly is declining, less popular now than a decade ago.

Will Reilly become more popular?

Reilly is trending downward. If the recent trend holds, we project roughly 53 girls named Reilly in 2030, which would rank outside the top 500. Forecasts assume the current trend continues and become less certain further out.

Who are famous people named Reilly?

Well-known people named Reilly include Reilly Opelka (tennis player).

Names like Reilly

Names that sound and feel close to Reilly: shared sounds, similar era, similar popularity. Each links to its full history.

Compare Reilly with similar names → More names starting with R →