Reilly
Girl name · #2844 in 2025 · Very rare
How old is the name Reilly? In official American birth records, Reilly has been tracked continuously since 1978, giving it 47 years of documented American history.
Reilly is currently the #2844 girl name in the United States — 60 babies received it in 2025. A decade ago it stood at #2123, so the name has been falling over the past ten years. Roughly one in every 30,000 girls born in 2025 was named Reilly.
Babies named Reilly per year. Source: Official national birth records.
The 47-year story
Reilly first appears in the Social Security records in 1978, when 6 girls received the name. Its peak came in 1998, when 379 girls were named Reilly — good for #623 that year. Today's parents encounter it on its way down the popularity curve, which for many parents is exactly the appeal. Following the curve matters more than today's snapshot: a name's position on its rise-peak-decline arc is the best predictor of how common it will feel in a kindergarten class five years from now.
Unlock the 5-year forecast and compare Reilly against up to 5 other names.
Uniqueness: will there be another Reilly in class?
On our rarity read — which blends how common Reilly is today with its five-year momentum — the name reads as "very rare". A high score means genuine rarity — your Reilly will likely be the only one in the room, with the occasional spelling-out as the price.
Where Reilly is most common
State-level data for Reilly is too sparse in 2025 to rank by rate — in most states its count falls below the SSA's per-state reporting threshold (counts under 5 are withheld).
Names like Reilly
Statistically, parents drawn to Reilly tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Emilly, Ally, Keely, Kayley, and Magaly.
EmillyAllyKeelyKayleyMagalyCarleySidneyRayven
Rank history (last 25 years)
| Year | Babies named Reilly | Rank |
|---|---|---|
| 2025 | 60 | #2822 |
| 2024 | 64 | #2694 |
| 2023 | 50 | #3225 |
| 2022 | 65 | #2661 |
| 2021 | 65 | #2638 |
| 2020 | 81 | #2216 |
| 2019 | 81 | #2249 |
| 2018 | 72 | #2457 |
| 2017 | 75 | #2401 |
| 2016 | 99 | #1996 |
| 2015 | 90 | #2123 |
| 2014 | 89 | #2139 |
| 2013 | 103 | #1929 |
| 2012 | 108 | #1859 |
| 2011 | 140 | #1564 |
| 2010 | 139 | #1574 |
| 2009 | 163 | #1432 |
| 2008 | 193 | #1286 |
| 2007 | 199 | #1244 |
| 2006 | 178 | #1314 |
| 2005 | 241 | #1011 |
| 2004 | 268 | #903 |
| 2003 | 276 | #869 |
| 2002 | 305 | #775 |
| 2001 | 325 | #737 |
Frequently asked questions
How old is the name Reilly?
In official American birth records, the name Reilly first appeared in 1978 (over 47 years ago), when 6 newborn girls received the name. It has been tracked in modern national records for 47 years.
Is Reilly a popular girl name?
Reilly ranked #2844 among girls in 2025 with 60 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #2123.
When was the name Reilly most popular?
Reilly peaked in 1998, when 379 American girls received the name (ranked #623 that year). Since 1998 the name has declined from that high.
How rare is the name Reilly?
In 2025, roughly 1 in 30,000 newborn American girls was named Reilly. On our rarity scale (rarity blended with momentum) we classify it as "very rare".
Data source: Official American birth records, 1880–2025, national and state files. Counts reflect registered birth records for American families.