How Many People Are Named Fionn?
An estimated 651 people in the United States have the first name Fionn. It is almost exclusively a male name. The average bearer is 13 years old, and Fionn peaked in popularity in 2018 with 40 births that year.
Below you will find a full statistical profile of Fionn 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 Fionn paired with any surname.
Estimated Living Americans
651
About 1 in 526,504 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
13
years old
Peak Year
2018
40 births
Total Registered
657
since 1880
Gender Distribution for Fionn
Fionn is almost exclusively a male name. Out of 657 total births registered, 100.0% were male.
Fionn as a male name
Ranked #4,594 in 2024
22 male births in 2024
Peak: 2018 (40 births)
Fionn: Popularity Over Time
SSA records for Fionn span from the 1970s to the 2020s, covering 5 decades of naming data. The most popular decade for this name was the 2010s, when 297 babies were registered. While Fionn is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Fionn by Decade
How has Fionn 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.
Fionn by State
Birth registrations for Fionn span all 4 states and territories in the SSA database. The highest counts are in California, New York, Massachusetts. The lowest are in Pennsylvania, Massachusetts, New York. On average, about 31 Fionns were registered per state.
Fionn + Last Name Combinations
How many people share a full name with Fionn as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Fionn
Other first names starting with F with a similar number of bearers.
Fionn: Questions and Answers
How many people in the U.S. are named Fionn?
We estimate approximately 651 people named Fionn 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 526,504 Americans share this first name.
Is Fionn a common name?
Fionn is classified as "Very Rare" and is more popular than 87% of all first names in the SSA database. A total of 657 births have been registered with this name since 1880.
When was Fionn most popular?
Fionn reached peak popularity in 2018, when 40 babies were given this name. The average age of a living person named Fionn is approximately 13 years old, reflecting when the name was most commonly given.
Is Fionn a male name?
Fionn is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Fionn Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Fionn Smith, Fionn Johnson, Fionn 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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