boy's name
Donnacha
DUN-uh-khuh
- Origin Irish
- Gender Boy
- Letters 8
- Popularity Top 100 (Ireland)
- Births on record 2,663
Ireland
#64
2025 births
Donnacha is a boy's name of Irish origin meaning "brown-haired warrior," from donn and cath. It ranks 64th in Ireland and was borne by a son of Brian Boru who ended up carrying the crown of Ireland to Rome.
- Donnacha is a name of Irish origin.
- Peaked in Ireland in 2022, when 140 babies were given the name.
- It has been rising over the past decade in Ireland.
- Today about 1 in 522 babies in Ireland is given this name.
- First appears in birth records in 1965.
Donnacha over time
Births per decade in Ireland, 1960s 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 |
|---|---|
| 1960s | 23 |
| 1970s | 75 |
| 1980s | 94 |
| 1990s | 83 |
| 2000s | 338 |
| 2010s | 1,047 |
| 2020s (to 2025) | 664 |
What Donnacha means
Donnacha means brown-haired warrior, or brown chieftain. The first element is donn, brown, generally read as describing hair, and the second is cath, battle, giving a compound that describes a fighter rather than a color alone.
Where Donnacha comes from
Donnacha is a spelling of the Irish Donnchadh, from donn, brown, and cath, battle. Its historical bearer is Donnchad mac Briain, son of Brian Boru, who became king of Munster after Clontarf and spent decades contesting the High Kingship with his nephew; deposed in 1063, he went on pilgrimage to Rome and died there, and tradition holds he took the Irish regalia with him. Donnchad was also the name of Scottish kings — Duncan, the king Macbeth kills in Shakespeare, is Donnchad mac Crinain, so Duncan and Donnacha are the same name arrived at through different languages. In Ireland the anglicizations went a different way: Denis and Donough were both used, Denis by sound alone, since it is a Greek name from Dionysos and unrelated.
Donnacha in use
Donnacha ranks 64th in Ireland with 86 births in 2025 and 93rd in Northern Ireland, and it is rising in our data with a peak in 2022. It is almost unused elsewhere — 4,281st in England and Wales. Our records carry it from 1965. The Donnchadh and Donncha spellings appear alongside it in Irish use, which spreads the total across several entries.
How popular is Donnacha?
In 2025, Donnacha was given to 86 babies in Ireland, ranking #64 that year. It is one of the most popular names in Ireland.
Where Donnacha is used
Irish figures withhold any name given to fewer than three babies in a year, so a gap means the name fell below that floor rather than went unused. The Central Statistics Office began recording the síneadh fada in 2018, so accented and unaccented spellings are counted separately from that year on. Data & sources.
Names that peaked alongside Donnacha
These names rose and fell in the same era, which is why they tend to sound like they belong together.
Parents who like Donnacha also like
Names whose popularity has risen and fallen in step with Donnacha over the last century — the same taste, a different name.
Donnacha 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.
Sibling names for Donnacha
Names from the same era that won't rhyme or share an initial with Donnacha — the two things that make a sibling set grate.
Common questions about Donnacha
What does the name Donnacha mean?
Donnacha means "brown-haired warrior," from donn, brown, and cath, battle.
Is Donnacha related to Duncan?
Yes — they are the same name. Duncan is the Scottish form of Donnchad.
How do you pronounce Donnacha?
DUN-uh-khuh, with the ch as in loch.
How popular is Donnacha?
Sixty-fourth in Ireland and 93rd in Northern Ireland.
Is Donnacha a girl's or a boy's name?
Donnacha is given almost entirely to boys in birth records.
Is Donnacha a good name?
That is not something records can settle, but they can tell you what you would be choosing. Donnacha currently ranks #64 in Ireland. It has been rising over the past decade. Everything else — how it sounds with your surname, who it reminds you of — is yours.