How Many People Are Named Isao?
An estimated 19 people in the United States have the first name Isao. It is almost exclusively a male name. The average bearer is 72 years old, and Isao peaked in popularity in 1925 with 20 births that year.
Below you will find a full statistical profile of Isao 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 Isao paired with any surname.
Key Insights
- With an average bearer age of 72, Isao is a vintage name most associated with earlier generations. Most living bearers were born before 1964.
- Isao is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
19
About 1 in 18,039,702 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
72
years old
Peak Year
1925
20 births
Total Registered
246
since 1880
Gender Distribution for Isao
Isao is almost exclusively a male name. Out of 246 total births registered, 100.0% were male.
Isao as a male name
Ranked #12,961 in 2016
5 male births in 2016
Peak: 1925 (20 births)
Isao: Popularity Over Time
SSA records for Isao span from the 1910s to the 2010s, covering 5 decades of naming data. The most popular decade for this name was the 1920s, when 128 babies were registered. Isao has declined significantly from its peak in the 1920s. Recent registrations are a fraction of what they were at the name's height.
Isao by Decade
How has Isao 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.
Isao by State
Isao + Last Name Combinations
How many people share a full name with Isao as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Isao
Other first names starting with I with a similar number of bearers.
Isao: Questions and Answers
How many people in the U.S. are named Isao?
We estimate approximately 19 people named Isao 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 18,039,702 Americans share this first name.
Is Isao a common name?
Isao is classified as "Very Rare" and is more popular than 39.1% of all first names in the SSA database. A total of 246 births have been registered with this name since 1880.
When was Isao most popular?
Isao reached peak popularity in 1925, when 20 babies were given this name. The average age of a living person named Isao is approximately 72 years old, reflecting when the name was most commonly given.
Is Isao a male name?
Isao is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Isao Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Isao Smith, Isao Johnson, Isao 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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