How Many People Are Named Isadore?
An estimated 1,261 people in the United States have the first name Isadore. It is predominantly male (96.7%). The average bearer is 55 years old, and Isadore peaked in popularity in 1916 with 285 births that year.
Below you will find a full statistical profile of Isadore 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 Isadore paired with any surname.
Key Insights
- While Isadore is overwhelmingly male, 195 female births have been registered with this name since 1880.
Estimated Living Americans
1,261
About 1 in 271,812 people in the U.S.
Rarity
Rare
Predicted Gender
Male
96.7% confidence
Average Age
55
years old
Peak Year
1916
285 births
Total Registered
5,894
since 1880
Gender Distribution for Isadore
Isadore is predominantly male (96.7%), though 195 female births have been registered. It functions as a unisex name for a small percentage of bearers.
Isadore as a male name
Ranked #8,566 in 2024
9 male births in 2024
Peak: 1916 (273 births)
Isadore as a female name
Ranked #11,465 in 2024
8 female births in 2024
Peak: 1917 (14 births)
Isadore: Popularity Over Time
SSA records for Isadore span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 1910s, when 2,045 babies were registered. Isadore has declined significantly from its peak in the 1910s. Recent registrations are a fraction of what they were at the name's height.
Isadore by Decade
How has Isadore 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.
Isadore by State
Birth registrations for Isadore span all 21 states and territories in the SSA database. The highest counts are in Pennsylvania, New York, Illinois. The lowest are in Indiana, Colorado, Texas. On average, about 132 Isadores were registered per state.
Isadore + Last Name Combinations
How many people share a full name with Isadore as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Isadore
Other first names starting with I with a similar number of bearers.
Isadore: Questions and Answers
How many people in the U.S. are named Isadore?
We estimate approximately 1,261 people named Isadore 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 271,812 Americans share this first name.
Is Isadore a common name?
Isadore is classified as "Rare" and is more popular than 91.5% of all first names in the SSA database. A total of 5,894 births have been registered with this name since 1880.
When was Isadore most popular?
Isadore reached peak popularity in 1916, when 285 babies were given this name. The average age of a living person named Isadore is approximately 55 years old, reflecting when the name was most commonly given.
Is Isadore a male name?
Isadore is predominantly male. 96.7% of people with this name are male. See the gender breakdown above for full details.
How many Isadore Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Isadore Smith, Isadore Johnson, Isadore 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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