Fionn is a rare spelling. It is summarised with Finn, which shares its sound and spelling pattern.
Meaning not yet researched.
Fionn: US boys given the name each year, 1880 to 2025, from Social Security card applications. 25 in 2025. Its best rank was #2,964 in 2018.
US births per year · SSA card applications
Peaked at #2,964 in 2018; #4,171 in 2025. Every baby recorded as Fionn in 2025 was a boy.
Baby name · US data 1880–2025
#4,171 for US boys in 2025. Its best year was 2018, at #2,964.
Hover, tap or use the arrow keys for any year. Years with fewer than five babies of a sex are not published by SSA and show as zero.
Fionn: US boys given the name each year from 1880 to 2025. 25 boys in 2025. Peak: #2,964 in 2018 · most boys in one year: 40 (2021).
In 2025, 25 US boys were named Fionn, making it the 4,171st most common boys’ name of the year, up 434 places from #4,605 in 2024. That is 3 more than the 22 boys named Fionn in 2024. Its best rank for boys was #2,964, reached in 2018. The most boys given the name in a single year was 40, in 2021. For comparison, it was #3,542 in 2015 and unranked in 1950.
Social Security card records list Fionn in 30 years of the 146 from 1880 to 2025, starting in 1973 with 5 babies. In all, 682 US babies have been given the name, all of them boys. Its busiest decade was the 2010s, with 297 babies named Fionn.
Over the 10 years from 2016 to 2025, 296 US boys were named Fionn; the busiest of those years was 2021, with 40. In 2025 that was about 1 in 68,323 of the boys in SSA’s list for the year.
Related spellings in the SSA files include Finn (35,380 babies since 1880) and Fynn (1,689 babies since 1880).
Meaning not yet researched.
We publish a meaning only with a cited source and a confidence label, and never generate one. Meanings are being researched for the most common names first.
Numbers are all-time US births. Links come from Wikidata’s “said to be the same as” (P460, CC0) and our spelling rule: at most two letters different, with the same sound pattern.
No nicknames listed for Fionn in the open dataset we use.
Source: carltonnorthern/nicknames (Apache-2.0).
Births and national rank for each year SSA lists the name, newest first.
| Year | Girls | Girls rank | Boys | Boys rank |
|---|---|---|---|---|
| 2025 | — | — | 25 | #4,171 |
| 2024 | — | — | 22 | #4,605 |
| 2023 | — | — | 31 | #3,650 |
| 2022 | — | — | 28 | #3,922 |
| 2021 | — | — | 40 | #3,038 |
| 2020 | — | — | 23 | #4,315 |
| 2019 | — | — | 25 | #4,152 |
| 2018 | — | — | 40 | #2,964 |
| 2017 | — | — | 33 | #3,405 |
| 2016 | — | — | 29 | #3,715 |
| 2015 | — | — | 31 | #3,542 |
| 2014 | — | — | 24 | #4,172 |
| 2013 | — | — | 28 | #3,690 |
| 2012 | — | — | 37 | #3,073 |
| 2011 | — | — | 25 | #4,022 |
| 2010 | — | — | 25 | #4,031 |
| 2009 | — | — | 29 | #3,663 |
| 2008 | — | — | 29 | #3,677 |
| 2007 | — | — | 20 | #4,692 |
| 2006 | — | — | 18 | #4,928 |
| 2005 | — | — | 25 | #3,751 |
| 2004 | — | — | 16 | #5,086 |
| 2003 | — | — | 15 | #5,119 |
| 2002 | — | — | 11 | #6,223 |
| 2001 | — | — | 13 | #5,472 |
| 2000 | — | — | 16 | #4,651 |
| 1999 | — | — | 6 | #9,074 |
| 1998 | — | — | 5 | #10,142 |
| 1997 | — | — | 8 | #6,819 |
| 1973 | — | — | 5 | #5,351 |
About the data: counts are Social Security card applications for US births, for names given to at least five babies of a sex in a year (SSA, names.zip, public domain). Ranks follow SSA’s own order: most births first, ties alphabetical. Files retrieved 2026-10-05 (checksum on our sources page).