boy's name
Tiernan
TEER-nan
- Origin Irish
- Gender Boy
- Syllables 2
- Letters 7
- Popularity Uncommon
- Births on record 4,795
Ireland
#116
2025 births
Tiernan is a boy's name of Irish origin meaning "little lord," and its most famous bearer's marriage troubles are traditionally blamed for bringing the Normans to Ireland. It ranks 116th in Ireland and 129th in Northern Ireland.
- Tiernan is a name of Irish origin.
- Peaked in 2009, when 95 babies were given the name.
- It has been falling over the past decade.
- Today about 1 in 114,325 babies in the United States is given this name.
- First appears in US birth records in 1985.
- 2 syllables, with the stress on syllable 1.
Tiernan over time
Births per decade in the United States, 1980s to 2020s. The striped bar is the 2020s, still in progress — it covers 2020 to 2025, not a full ten years.
Show the numbers
| Decade | Births |
|---|---|
| 1980s | 20 |
| 1990s | 186 |
| 2000s | 779 |
| 2010s | 511 |
| 2020s (to 2025) | 180 |
What Tiernan means
Tiernan means little lord, or lordly one, from the Irish tighearna, a lord or master, with a diminutive ending. The word is the ordinary one for a lord and also serves for the Lord in religious use.
Where Tiernan comes from
Tiernan anglicizes the Irish Tighearnán, from tighearna, a lord, with the diminutive -án. Its bearer is Tighearnán Ua Ruairc, king of Bréifne in the twelfth century, whose wife Derbforgaill left with — or was abducted by — Diarmait Mac Murchada, king of Leinster, in 1152. Tighearnán's pursuit of that grievance eventually drove Diarmait out of Ireland, and Diarmait went to Henry II for help, which brought the Normans in 1169. The chain from a marital dispute to eight centuries of English involvement is the version Irish schoolchildren learn, and it flattens a great deal, but Tighearnán is genuinely at the start of it. The surname McTiernan and the place name Ballytiernan come from the same source.
Tiernan in use
Tiernan ranks 116th in Ireland with 51 births in 2025 and 129th in Northern Ireland, and it is falling in our data from a peak in 2009. Our records carry it from 1985. It is rare outside the island at 3,038th in England and Wales and 3,784th in the United States, and the Irish-spelled Tiarnan is written up separately, and Tiarnan ranks 125th in Northern Ireland.
How popular is Tiernan?
In 2025, Tiernan was given to 29 babies in the United States. It is used consistently but remains uncommon.
Where Tiernan is used
US figures omit any name given to fewer than five babies in a year, so the rarest names are absent from the source rather than absent from use. Data & sources.
How Tiernan is spelled
Birth registers count each spelling separately, so every one has its own ranking.
| Spelling | What it is | Births on record |
|---|---|---|
| Tiernán | Tiernán is a rare spelling of Tiernan, written with a fada and recorded 9 times, mostly in Ireland. | 9 |
Names that peaked alongside Tiernan
These names rose and fell in the same era, which is why they tend to sound like they belong together.
Parents who like Tiernan also like
Names whose popularity has risen and fallen in step with Tiernan over the last century — the same taste, a different name.
Tiernan in other languages
The same name as it is spelled elsewhere — not shortenings, and not different names that merely sound alike. Each one has its own record here.
- Other forms
- Forms we hold no single language for — some are used across several, some are simply spelled differently.
- Tierney Tiarnan Tighearnan
Sibling names for Tiernan
Names from the same era that won't rhyme or share an initial with Tiernan — the two things that make a sibling set grate.
Common questions about Tiernan
What does the name Tiernan mean?
Tiernan means "little lord," from the Irish tighearna, a lord.
Who was Tighearnán Ua Ruairc?
A twelfth-century king of Bréifne whose feud with Diarmait Mac Murchada is traditionally blamed for bringing the Normans to Ireland.
What is the difference between Tiernan and Tiarnan?
Only spelling. Tiarnan is closer to the Irish and is more common in Northern Ireland.
How popular is Tiernan?
116th in Ireland and 129th in Northern Ireland.
Is Tiernan a girl's or a boy's name?
Tiernan is given almost entirely to boys in birth records.
How many syllables are in Tiernan?
Tiernan has 2 syllables.
Is Tiernan a good name?
That is not something records can settle, but they can tell you what you would be choosing. Tiernan currently ranks #116 in the United States. It has been falling over the past decade. Everything else — how it sounds with your surname, who it reminds you of — is yours.