How Many People Are Named Iwao?
An estimated 6 people in the United States have the first name Iwao. It is almost exclusively a male name. The average bearer is 104 years old, and Iwao peaked in popularity in 1921 with 20 births that year.
Below you will find a full statistical profile of Iwao 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 Iwao paired with any surname.
Key Insights
- With an average bearer age of 104, Iwao is a vintage name most associated with earlier generations. Most living bearers were born before 1932.
- Iwao is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
6
About 1 in 57,125,723 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
104
years old
Peak Year
1921
20 births
Total Registered
178
since 1880
Gender Distribution for Iwao
Iwao is almost exclusively a male name. Out of 178 total births registered, 100.0% were male.
Iwao as a male name
Ranked #3,793 in 1936
5 male births in 1936
Peak: 1921 (20 births)
Iwao: Popularity Over Time
SSA records for Iwao span from the 1910s to the 1930s, covering 3 decades of naming data. The most popular decade for this name was the 1920s, when 109 babies were registered. Iwao has declined significantly from its peak in the 1920s. Recent registrations are a fraction of what they were at the name's height.
Iwao by Decade
How has Iwao 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.
Iwao by State
Iwao + Last Name Combinations
How many people share a full name with Iwao as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Iwao
Other first names starting with I with a similar number of bearers.
Iwao: Questions and Answers
How many people in the U.S. are named Iwao?
We estimate approximately 6 people named Iwao 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 57,125,723 Americans share this first name.
Is Iwao a common name?
Iwao is classified as "Very Rare" and is more popular than 22.3% of all first names in the SSA database. A total of 178 births have been registered with this name since 1880.
When was Iwao most popular?
Iwao reached peak popularity in 1921, when 20 babies were given this name. The average age of a living person named Iwao is approximately 104 years old, reflecting when the name was most commonly given.
Is Iwao a male name?
Iwao is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Iwao Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Iwao Smith, Iwao Johnson, Iwao 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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