Isidore Boy
How popular is Isidore?
#3,582 boy name in 2025
31 baby boys were named Isidore in the US in 2025, making it the 3582nd most popular boy name.
Isidore popularity over time
| Rank in 2025 | #3,582 for boys (▼ 129 from 2024) |
|---|---|
| Babies in 2025 | 31 boys |
| 10-year trend | Rising fast (+182% babies vs 2015) |
| Earlier ranks | #7,061 in 2015, #7,029 in 2020 |
| Peak year | 1919 (183 boys) |
| Highest rank | #379 in 1914 |
| First recorded | 1881 |
| Boys vs girls (last 10 years) | 100% boys, 0% girls |
| Chance a classmate shares it | 0.0% in a class of 25 kids born in 2025 |
Isidore counting every spelling
Social Security counts each spelling as its own name. Adding together the spellings that sound alike, the Isidore family of names ranked #2,501 for boys in 2025 (#2,386 the year before), with 38 babies in all.
| Spelling | Boys in 2025 | Share |
|---|---|---|
| Isidore | 31 | 82% |
| Isidor | 7 | 18% |
Spellings are grouped by how they sound, using our own rules, so a few groupings may not match how your family says the name.
Where Isidore is most popular
Babies named Isidore per 1,000 boys born in each state, 2021 to 2025. Darker means more common.
- New York: 0.0 per 1,000 (10 boys)
Isidore by decade
| Decade | Baby boys | Best rank |
|---|---|---|
| 1880s | 39 | #780 |
| 1890s | 72 | #521 |
| 1900s | 159 | #422 |
| 1910s | 1,357 | #379 |
| 1920s | 849 | #535 |
| 1930s | 180 | #1,116 |
| 1940s | 101 | #1,909 |
| 1950s | 135 | #1,682 |
| 1960s | 98 | #1,804 |
| 1970s | 31 | #3,519 |
| 1980s | 20 | #4,507 |
| 1990s | 30 | #5,375 |
| 2000s | 64 | #6,515 |
| 2010s | 130 | #3,989 |
| 2020s | 156 | #3,414 |
Boy names about as popular as Isidore
Questions
- Is Isidore a boy or girl name?
- Isidore is mostly a boy name. Over the last 10 years, 100% of babies named Isidore were boys.
- How popular is the name Isidore?
- 31 baby boys were named Isidore in the US in 2025, making it the 3582nd most popular boy name.
- When was Isidore most popular?
- Isidore peaked in 1919, when 183 boys were given the name. Its highest rank was #379 in 1914.
- How many people are named Isidore?
- 3,421 babies have been named Isidore in the US since 1880. We estimate about 688 of them are alive in 2026, with a median age of 26.
- Where is Isidore most popular?
- From 2021 to 2025, Isidore was most common in New York, at 0.0 of every 1,000 boys born there.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.