How Many People Are Named Isidore?
An estimated 717 people in the United States have the first name Isidore. It is almost exclusively a male name. The average bearer is 44 years old, and Isidore peaked in popularity in 1919 with 183 births that year.
Below you will find a full statistical profile of Isidore as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Isidore paired with any surname.
Estimated Living Americans
717
About 1 in 478,040 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
44
years old
Peak Year
1919
183 births
Total Registered
3,390
since 1880
Gender Distribution for Isidore
Isidore is almost exclusively a male name. Out of 3,390 total births registered, 100.0% were male.
Isidore as a male name
Ranked #3,473 in 2024
33 male births in 2024
Peak: 1919 (183 births)
Isidore: Popularity Over Time
SSA records for Isidore span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 1910s, when 1,357 babies were registered. Isidore has declined significantly from its peak in the 1910s. Recent registrations are a fraction of what they were at the name's height.
Isidore by Decade
How has Isidore tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Isidore by State
Birth registrations for Isidore span all 5 states and territories in the SSA database. The highest counts are in New York, Pennsylvania, Massachusetts. The lowest are in Texas, Maryland, Massachusetts. On average, about 383 Isidores were registered per state.
Isidore + Last Name Combinations
How many people share a full name with Isidore as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Isidore
Other first names starting with I with a similar number of bearers.
Isidore: Questions and Answers
How many people in the U.S. are named Isidore?
We estimate approximately 717 people named Isidore are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 478,040 Americans share this first name.
Is Isidore a common name?
Isidore is classified as "Very Rare" and is more popular than 87.8% of all first names in the SSA database. A total of 3,390 births have been registered with this name since 1880.
When was Isidore most popular?
Isidore reached peak popularity in 1919, when 183 babies were given this name. The average age of a living person named Isidore is approximately 44 years old, reflecting when the name was most commonly given.
Is Isidore a male name?
Isidore is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Isidore Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Isidore Smith, Isidore Johnson, Isidore Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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