Tiernan
How to say it: TEER-nun · /ˈtɪrnən/
From Irish 'O Tighearnaigh' meaning 'descendant of the little lord' - traditional Irish surname now first name.
Tiernan was the 3,037th most popular boys’ name in the United States in 2025, given to 29 babies (Social Security Administration). Its busiest decade was the 2000s, its births are down about 33% in ten years, and it is projected to rise to #2,687 by 2030.
Updated · SSA 2025 data, published May 2026 · How we compute these figures
Key facts
| Rank among boys’ names, 2025 | #3,037 |
|---|---|
| Babies born in 2025 | 29 |
| Share of births | 1 in 114,322 |
| Peak decade | 2000s |
| Change over 10 years | −33% |
| Projected rank for 2030 (estimate) | #2,687 |
Sources: Social Security Administration (SSA). How we compute these figures.
Its life, decade by decade
Tiernan is a newcomer: almost all of its history is from the last forty years.
What goes with it
In the classroom
In a class of 25 children born in 2025, the chance that another child is called Tiernan is about under 1 in 200.
Around the world
This spelling is used in English, Irish.
Ireland: #117.
Keep exploring
About as popular as Tiernan
Find names you'll both love, starting with Tiernan
The one-minute style quiz.