Isidore
Boy name · #3584 in 2025 · Very rare
How old is the name Isidore? In official American birth records, Isidore has been tracked continuously since 1881, giving it 144 years of documented American history.
Isidore is currently the #3584 boy name in the United States — 31 babies received it in 2025. A decade ago it stood at #7066, so the name has been rising over the past ten years. Roughly one in every 58,065 boys born in 2025 was named Isidore.
The 144-year story
Isidore first appears in the Social Security records in 1881, when 6 boys received the name. Its peak came in 1919, when 183 boys were named Isidore — good for #435 that year. Today's parents encounter it as a name from their grandparents’ generation, which is precisely the vintage window from which names get revived. 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.
Babies named Isidore per year. Source: Official national birth records.
Unlock the 5-year forecast and compare Isidore against up to 5 other names.
Uniqueness: will there be another Isidore in class?
On our rarity read — which blends how common Isidore is today with its five-year momentum — the name reads as "very rare". A high score means genuine rarity — your Isidore will likely be the only one in the room, with the occasional spelling-out as the price.
Where Isidore is most common
State-level data for Isidore 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 Isidore
Statistically, parents drawn to Isidore tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Hartley, Judge, Casimir, Florian, and Alphonse.
HartleyJudgeCasimirFlorianAlphonseJuneHarlandHenderson
Rank history (last 25 years)
| Year | Babies named Isidore | Rank |
|---|---|---|
| 2025 | 31 | #3583 |
| 2024 | 33 | #3455 |
| 2023 | 34 | #3416 |
| 2022 | 16 | #5633 |
| 2021 | 31 | #3582 |
| 2020 | 11 | #7034 |
| 2019 | 20 | #4806 |
| 2018 | 26 | #3993 |
| 2017 | 14 | #6060 |
| 2016 | 11 | #7157 |
| 2015 | 11 | #7066 |
| 2014 | 15 | #5733 |
| 2013 | 13 | #6241 |
| 2012 | 5 | #12274 |
| 2011 | 7 | #9600 |
| 2010 | 8 | #8803 |
| 2009 | 5 | #12491 |
| 2008 | 9 | #8324 |
| 2007 | 9 | #8173 |
| 2006 | 5 | #12055 |
| 2005 | 7 | #9115 |
| 2004 | 6 | #9948 |
| 2003 | 7 | #8643 |
| 2002 | 10 | #6522 |
| 2000 | 6 | #9112 |
Frequently asked questions
How old is the name Isidore?
In official American birth records, the name Isidore first appeared in 1881 (over 144 years ago), when 6 newborn boys received the name. It has over a century of continuous American history.
Is Isidore a popular boy name?
Isidore ranked #3584 among boys in 2025 with 31 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #7066.
When was the name Isidore most popular?
Isidore peaked in 1919, when 183 American boys received the name (ranked #435 that year). Since 1919 the name has declined from that high.
How rare is the name Isidore?
In 2025, roughly 1 in 58,065 newborn American boys was named Isidore. 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.