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2025 data, released 8 May 2026

2025 data, released 8 May 2026

Fionn

Fionn was the 4171st most popular name for boys in 2025, given to 25 babies. Its best year was 2018, when it ranked 2964th with 40 babies. Over the last ten years it has moved down 629 places. More babies were named Fionn in the 2010s than in any other decade.

Meaning Not yet researched how we research meanings

Rank in 2025
#4,171 boys, up 144 places since 2020
Babies in 2025
25boys
Girls and boys
Almost always a boy’s name2021–2025
Peak year
201840 babies
Total since 1880
682babies recorded

Fionn popularity since 1880

012.52537.550 1900192019401960198020002020
Boys Babies per year, US, from Social Security records. Years with fewer than 5 babies show as zero.
YearRank (boys)Babies (boys)
2025#4,17125
2020#4,31523
2010#4,03125
2000#4,65116
1990——
1980——
1970——
1960——
1950——
1940——
1930——
1920——
1910——
1900——
1890——
1880——

How popular is Fionn, counting every spelling?

Fionn has no other common spelling that sounds the same.

How many kids will share the name Fionn?

25 of the 3,606,400 babies born in the US in 2025 were named Fionn (0.01 per 1,000 births). For a boy named Fionn born in 2025, the chance that another child with the same name is in a class of 20 children the same age is under 1 in 50. If every grade liked the name as much as the 2025 babies do, only about one elementary school in 337 (of 430 pupils) would have a child named Fionn.

Chance of another Fionn in a class of 20under 1 in 50US, born 2025
Most likely inNew Yorkunder 1 in 50 (2024)

Shares of all registered births (NCHS); classes assumed to be children born the same year. How we estimate this.

How old are people named Fionn?

About 700 people born in the US named Fionn are alive today, with a median age of 12; half are between 7 and 18. That makes Fionn a young name: most people with it are children.

0–910–1920–2930–3940–4950–5960–6970–7980–8990+
Estimated people alive in the US with the name, by age, mid-2026. The darker bar holds the median age.

Babies given the name each year (SSA) times the share of that birth year still alive (SSA life tables). Counts people born in the US only. Method.

Fionn by state

How common Fionn was among boys born in each state in 2021–2025. In 49 states fewer than five boys a year got the name, too few for SSA to publish, so those states show as zero.

Alaska: fewer than 5 a yearAK–Maine: fewer than 5 a yearME–Wisconsin: fewer than 5 a yearWI–Vermont: fewer than 5 a yearVT–New Hampshire: fewer than 5 a yearNH–Washington: fewer than 5 a yearWA–Idaho: fewer than 5 a yearID–Montana: fewer than 5 a yearMT–North Dakota: fewer than 5 a yearND–Minnesota: fewer than 5 a yearMN–Illinois: fewer than 5 a yearIL–Michigan: fewer than 5 a yearMI–New York: 0.04 per 1,000 babiesNY0.04Massachusetts: fewer than 5 a yearMA–Oregon: fewer than 5 a yearOR–Nevada: fewer than 5 a yearNV–Wyoming: fewer than 5 a yearWY–South Dakota: fewer than 5 a yearSD–Iowa: fewer than 5 a yearIA–Indiana: fewer than 5 a yearIN–Ohio: fewer than 5 a yearOH–Pennsylvania: fewer than 5 a yearPA–New Jersey: fewer than 5 a yearNJ–Connecticut: fewer than 5 a yearCT–Rhode Island: fewer than 5 a yearRI–California: 0.01 per 1,000 babiesCA0.01Utah: fewer than 5 a yearUT–Colorado: fewer than 5 a yearCO–Nebraska: fewer than 5 a yearNE–Missouri: fewer than 5 a yearMO–Kentucky: fewer than 5 a yearKY–West Virginia: fewer than 5 a yearWV–Virginia: fewer than 5 a yearVA–Maryland: fewer than 5 a yearMD–Delaware: fewer than 5 a yearDE–Arizona: fewer than 5 a yearAZ–New Mexico: fewer than 5 a yearNM–Kansas: fewer than 5 a yearKS–Arkansas: fewer than 5 a yearAR–Tennessee: fewer than 5 a yearTN–North Carolina: fewer than 5 a yearNC–South Carolina: fewer than 5 a yearSC–District of Columbia: fewer than 5 a yearDC–Oklahoma: fewer than 5 a yearOK–Louisiana: fewer than 5 a yearLA–Mississippi: fewer than 5 a yearMS–Alabama: fewer than 5 a yearAL–Georgia: fewer than 5 a yearGA–Hawaii: fewer than 5 a yearHI–Texas: fewer than 5 a yearTX–Florida: fewer than 5 a yearFL–
Babies per 1,000 of the same sex, Fionn, boys, 2021–2025. Darker means more common.

Names with a similar history

These names rose and fell in step with Fionn: their share of US boys followed the most similar curve since 1880. If you like Fionn, they share its era and feel.

Questions about the name Fionn

How popular is the name Fionn?

Fionn was the 4171st most popular name for boys in 2025, given to 25 babies. Its best year was 2018, when it ranked 2964th with 40 babies. Over the last ten years it has moved down 629 places. More babies were named Fionn in the 2010s than in any other decade.

Is Fionn a boy or girl name?

In 2021–2025, almost always a boy’s name given the name Fionn in the US.

Where is Fionn most popular?

In 2021–2025, Fionn was most common in New York (0.04 per 1,000 boys), followed by California and California.