Fionn
Boy name · #4178 in 2025 · Very rare
Fionn ranks #4178 among American boys' names as of 2025, with 25 newborns given the name that year. A decade ago it stood at #3513, so the name has been falling over the past ten years. Roughly one in every 72,000 boys born in 2025 was named Fionn.
Babies named Fionn per year. Source: SSA.
The 52-year story
Fionn first appears in the Social Security records in 1973, when 5 boys received the name. Its peak came in 2018, when 40 boys were named Fionn — good for #2943 that year. Today's parents encounter it on its way down the popularity curve, which for many parents is exactly the appeal. Following the curve matters more than today's snapshot: a name's position on its rise-peak-decline arc is the best predictor of how common it will feel in a kindergarten class five years from now.
Unlock the 5-year forecast and compare Fionn against up to 5 other names.
Uniqueness: will there be another Fionn in class?
On our rarity read — which blends how common Fionn is today with its five-year momentum — the name reads as "very rare". A high score means genuine rarity — your Fionn will likely be the only one in the room, with the occasional spelling-out as the price.
Where Fionn is most common
State-level data for Fionn is too sparse in 2025 to rank by rate — in most states its count falls below the SSA's per-state reporting threshold (counts under 5 are withheld).
Names like Fionn
Statistically, parents drawn to Fionn tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Fynn, Espen, Emran, Faizan, and Nayan.
FynnEspenEmranFaizanNayanCalanKirinAdyan
Rank history (last 25 years)
| Year | Babies named Fionn | Rank |
|---|---|---|
| 2025 | 25 | #4139 |
| 2024 | 22 | #4571 |
| 2023 | 31 | #3629 |
| 2022 | 28 | #3879 |
| 2021 | 40 | #3021 |
| 2020 | 23 | #4275 |
| 2019 | 25 | #4114 |
| 2018 | 40 | #2943 |
| 2017 | 33 | #3378 |
| 2016 | 29 | #3681 |
| 2015 | 31 | #3513 |
| 2014 | 24 | #4138 |
| 2013 | 28 | #3661 |
| 2012 | 37 | #3059 |
| 2011 | 25 | #3994 |
| 2010 | 25 | #3994 |
| 2009 | 29 | #3639 |
| 2008 | 29 | #3646 |
| 2007 | 20 | #4640 |
| 2006 | 18 | #4865 |
| 2005 | 25 | #3710 |
| 2004 | 16 | #5007 |
| 2003 | 15 | #5035 |
| 2002 | 11 | #6088 |
| 2001 | 13 | #5390 |
Frequently asked questions
Is Fionn a popular boy name?
Fionn ranked #4178 among boys in 2025 with 25 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #3513.
When was the name Fionn most popular?
Fionn peaked in 2018, when 40 American boys received the name (ranked #2943 that year). Since 2018 the name has declined from that high.
How rare is the name Fionn?
In 2025, roughly 1 in 72,000 newborn American boys was named Fionn. On our rarity scale (rarity blended with momentum) we classify it as "very rare".
Data source: U.S. Social Security Administration name statistics, 1880–2025, national and state files. Counts reflect Social Security card applications; names with fewer than 5 occurrences in a state-year are suppressed by the SSA.