How Many People Are Named Oisin?
An estimated 486 people in the United States have the first name Oisin. It is almost exclusively a male name. The average bearer is 13 years old, and Oisin peaked in popularity in 2020 with 31 births that year.
Below you will find a full statistical profile of Oisin 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 Oisin paired with any surname.
Estimated Living Americans
486
About 1 in 705,256 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
13
years old
Peak Year
2020
31 births
Total Registered
491
since 1880
Gender Distribution for Oisin
Oisin is almost exclusively a male name. Out of 491 total births registered, 100.0% were male.
Oisin as a male name
Ranked #4,145 in 2024
26 male births in 2024
Peak: 2020 (31 births)
Oisin: Popularity Over Time
SSA records for Oisin span from the 1990s to the 2020s, covering 4 decades of naming data. The most popular decade for this name was the 2010s, when 181 babies were registered. While Oisin is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Oisin by Decade
How has Oisin 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.
Oisin by State
Birth registrations for Oisin span all 3 states and territories in the SSA database. The highest counts are in New York, California, Massachusetts. The lowest are in Massachusetts, California, New York. On average, about 15 Oisins were registered per state.
Oisin + Last Name Combinations
How many people share a full name with Oisin as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Oisin
Other first names starting with O with a similar number of bearers.
Oisin: Questions and Answers
How many people in the U.S. are named Oisin?
We estimate approximately 486 people named Oisin 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 705,256 Americans share this first name.
Is Oisin a common name?
Oisin is classified as "Very Rare" and is more popular than 84.3% of all first names in the SSA database. A total of 491 births have been registered with this name since 1880.
When was Oisin most popular?
Oisin reached peak popularity in 2020, when 31 babies were given this name. The average age of a living person named Oisin is approximately 13 years old, reflecting when the name was most commonly given.
Is Oisin a male name?
Oisin is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Oisin Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Oisin Smith, Oisin Johnson, Oisin 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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