4,587births recorded
7Countries
1Variants
2004Peak · Northern Ireland
#99Northern Ireland 2025
Tiernan is a boy name family recorded 4,587 times in 7 countries since 1971. It ranks highest today in Northern Ireland (#99 in 2025). Its all-time peak was in Northern Ireland in 2004, at 293.4 births per 100,000.
Popularity by country
Births per 100,000 newborns, all forms of the name combined.
All forms of Tiernan
| Variants | Language | Total births | Country | Latest rank | Peak year | 10-year trend |
|---|---|---|---|---|---|---|
| Tiernan | English | 1,676 | 🇺🇸 United States | #3757 | 2009 | ▼ 37 % |
| Tiernan | English | 1,460 | 🇮🇪 Ireland | #115 | 2022 | ▲ 66 % |
| Tiernan | English | 1,003 | 🇬🇧 Northern Ireland | #99 | 2004 | ▲ 107 % |
| Tiernan | English | 380 | 🏴 England & Wales | #2939 | 1999 | ▼ 34 % |
| Tiernan | English | 35 | 🏴 Scotland | #441 | 2025 | – |
| Tiernan | English | 27 | 🇨🇦 Ontario | – | 2008 | – |
Questions about Tiernan
How popular is the name Tiernan?
In 2025 it ranked #99 in Northern Ireland. Official registers record 4,587 births across 7 countries.
When was Tiernan most popular?
It peaked in Northern Ireland in 2004, at 293.4 births per 100,000.
Is Tiernan a boy or a girl name?
In official birth registers, Tiernan is a boy name.