Fionn
2025 SSA
Below 5 births
About Fionn
Fionn, the modern Irish form of Finn, is more popular in Ireland these days than Finn, which is rising fast in the U.S. where Fionn is virtually unknown. That's probably a good thing, because few Americans would know that Fionn and Finn have the same root and are pronounced the same, like the fin of a fish. It's the namesake of a great hero from Irish mythology, Fionn MacCumhaill, who acquired divine wisdom by eating an enchanted salmon of knowledge.
Fionn for girls
Fionn is the Irish form of the name modernized as Finn, but popular in this form in Ireland, where it's in the boys' Top 20. A couple dozen baby boys in the US were named Fionn last year and no baby girls, though there were girls named Finn, Fionna, and Fionnuala, so Fionn may be thought of as a variation or short form of those names.
Pronounced FEE-un.
As of October 2026, Fionn ranked #4171 in US births in 2025 SSA, peaked at #2963 in 2018.
Popularity & trends
Data table
| Year | US rank | Births | Per million |
|---|---|---|---|
| 2014 | #4,172 | 24 | 12.5 |
| 2015 | #3,541 | 31 | 16.2 |
| 2016 | #3,715 | 29 | 15.3 |
| 2017 | #3,403 | 33 | 17.8 |
| 2018 | #2,963 | 40 | 22 |
| 2019 | #4,151 | 25 | 13.9 |
| 2020 | #4,312 | 23 | 13.3 |
| 2021 | #3,038 | 40 | 22.9 |
| 2022 | #3,918 | 28 | 16 |
| 2023 | #3,646 | 31 | 18.1 |
| 2024 | #4,594 | 22 | 12.8 |
| 2025 | #4,171 | 25 | 14.6 |
World rankings
Fionn for boys
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Fionn on lists
Famous Fionns
- Fionn ReganBoy
Irish singer,songwriter
- Fionn MacColla (born Thomas Douglas MacDonald)Boy
Scottish novelist
- Fionn CarrBoy
Irish rugby union player
- Fionn WhiteheadBoy
Actor
Fionn in pop culture
- Fionn Mac CumhaillBoy
Irish mythological hero