Tiernan
Boy name · #3799 in 2025 · Very rare
How old is the name Tiernan? In official American birth records, Tiernan has been tracked continuously since 1985, giving it 40 years of documented American history.
Tiernan is currently the #3799 boy name in the United States — 29 babies received it in 2025. A decade ago it stood at #2641, so the name has been falling over the past ten years. Roughly one in every 62,069 boys born in 2025 was named Tiernan.
The 40-year story
Tiernan first appears in the Social Security records in 1985, when 5 boys received the name. Its peak came in 2007, when 86 boys were named Tiernan — good for #1728 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.
Babies named Tiernan per year. Source: Official national birth records.
Unlock the 5-year forecast and compare Tiernan against up to 5 other names.
Uniqueness: will there be another Tiernan in class?
On our rarity read — which blends how common Tiernan is today with its five-year momentum — the name reads as "very rare". A high score means genuine rarity — your Tiernan will likely be the only one in the room, with the occasional spelling-out as the price.
Where Tiernan is most common
State-level data for Tiernan 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 Tiernan
Statistically, parents drawn to Tiernan tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Kiernan, Teegan, Tayvion, Cainan, and Terrion.
KiernanTeeganTayvionCainanTerrionQuinlanTeganKeylan
Rank history (last 25 years)
| Year | Babies named Tiernan | Rank |
|---|---|---|
| 2025 | 29 | #3757 |
| 2024 | 26 | #4072 |
| 2023 | 35 | #3347 |
| 2022 | 38 | #3151 |
| 2021 | 32 | #3497 |
| 2020 | 20 | #4698 |
| 2019 | 24 | #4230 |
| 2018 | 28 | #3793 |
| 2017 | 26 | #3993 |
| 2016 | 36 | #3161 |
| 2015 | 46 | #2641 |
| 2014 | 49 | #2516 |
| 2013 | 53 | #2364 |
| 2012 | 56 | #2292 |
| 2011 | 73 | #1905 |
| 2010 | 73 | #1924 |
| 2009 | 85 | #1774 |
| 2008 | 78 | #1861 |
| 2007 | 86 | #1728 |
| 2006 | 67 | #1994 |
| 2005 | 69 | #1854 |
| 2004 | 68 | #1815 |
| 2003 | 62 | #1885 |
| 2002 | 55 | #1998 |
| 2001 | 49 | #2117 |
Frequently asked questions
How old is the name Tiernan?
In official American birth records, the name Tiernan first appeared in 1985 (over 40 years ago), when 5 newborn boys received the name. It has been tracked in modern national records for 40 years.
Is Tiernan a popular boy name?
Tiernan ranked #3799 among boys in 2025 with 29 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #2641.
When was the name Tiernan most popular?
Tiernan peaked in 2007, when 86 American boys received the name (ranked #1728 that year). Since 2007 the name has declined from that high.
How rare is the name Tiernan?
In 2025, roughly 1 in 62,069 newborn American boys was named Tiernan. On our rarity scale (rarity blended with momentum) we classify it as "very rare".
Data source: Official American birth records, 1880–2025, national and state files. Counts reflect registered birth records for American families.