How Many People Are Named Osamu?
An estimated 19 people in the United States have the first name Osamu. It is almost exclusively a male name. The average bearer is 53 years old, and Osamu peaked in popularity in 1925 with 11 births that year.
Below you will find a full statistical profile of Osamu 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 Osamu paired with any surname.
Key Insights
- Osamu 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
53
years old
Peak Year
1925
11 births
Total Registered
94
since 1880
Gender Distribution for Osamu
Osamu is almost exclusively a male name. Out of 94 total births registered, 100.0% were male.
Osamu as a male name
Ranked #10,379 in 1997
5 male births in 1997
Peak: 1925 (11 births)
Osamu: Popularity Over Time
SSA records for Osamu span from the 1920s to the 1990s, covering 5 decades of naming data. The most popular decade for this name was the 1920s, when 58 babies were registered. Osamu has declined significantly from its peak in the 1920s. Recent registrations are a fraction of what they were at the name's height.
Osamu by Decade
How has Osamu 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.
Osamu by State
Osamu + Last Name Combinations
How many people share a full name with Osamu as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Osamu
Other first names starting with O with a similar number of bearers.
Osamu: Questions and Answers
How many people in the U.S. are named Osamu?
We estimate approximately 19 people named Osamu 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 Osamu a common name?
Osamu is classified as "Very Rare" and is more popular than 39.1% of all first names in the SSA database. A total of 94 births have been registered with this name since 1880.
When was Osamu most popular?
Osamu reached peak popularity in 1925, when 11 babies were given this name. The average age of a living person named Osamu is approximately 53 years old, reflecting when the name was most commonly given.
Is Osamu a male name?
Osamu is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Osamu Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Osamu Smith, Osamu Johnson, Osamu 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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