Understanding Ó Deargáin, Dargan and Dorgan
One of the most important questions in the Dorgan family research has been deceptively simple:
What was the original Irish form of the family name?
Over the years, several forms appeared in books, indexes, family histories, and surname references, including Dargan, Dorgan, Ó Deargáin, Ó Dorcháin, and Ó Dorchaidhe.
In 2005, William J. Dorgan III asked Jerry Kelly, a researcher with extensive knowledge of the Irish language, Gaelic genealogy, and early Irish historical sources, for help resolving the question.
Jerry’s correspondence became an important part of the Dorgan family research.
His central conclusion was clear:
The ancestral Irish surname is Ó Deargáin.
The Question Sent to Jerry Kelly
By 2005, the family records themselves presented an intriguing pattern.
The older Patrick Dargan / Dorgan of Carrigkilter appeared as Dargan in important nineteenth-century records, while later generations increasingly used Dorgan.
At the same time, published surname references did not always agree about the original Irish-language form.
Bill therefore asked Jerry Kelly to examine the competing possibilities, particularly:
DORGAN / Ó DORCHÁIN
and
DARGAN / Ó DEARGÁIN
Jerry replied on 11 June 2005.
His email was titled:
“DORGAN/O'DORCHAIN or DARGAN/O'DEARGAIN?”
Jerry’s Conclusion: Ó Deargáin
Jerry compared the Dorgan and Dargan forms with the work of several major authorities on Irish surnames, including Edward MacLysaght, Brian de Breffny, and Patrick Woulfe.
MacLysaght associated Dargan with the Irish Ó Deargáin and noted that in County Cork the name took the form Dorgan.
De Breffny likewise connected Dorgan with Ó Deargáin and associated the Dorgan spelling particularly with County Cork.
Woulfe listed forms including Dargan, Dergan, Dorgan, and Dorrigan under Ó Deargáin.
Jerry’s conclusion to Bill was direct:
“There’s no doubt that your original surname is actually Ó Deargáin.”
For this family history, Ó Deargáin is therefore the preferred historical Irish form of the surname.
From Dargan to Dorgan in East Cork
The distinction is especially important because the family’s own records preserve both forms.
The older Patrick appears as Patrick Dargan in nineteenth-century East Cork records, including Griffith’s Valuation.
By the later nineteenth century, the spelling Dorgan became increasingly established in church, civil, and later American records.
Jerry viewed the coexistence of the two spellings as evidence of the way an Irish surname could change as it passed through English-language record keeping.
The spelling changed.
The family identity did not.
For genealogical research, both forms must therefore be searched:
Dargan
and
Dorgan
A search limited to only one spelling can easily miss records belonging to the same family.
Why Not Ó Dorcháin?
One of Jerry Kelly’s most useful contributions was his examination of the alternative form Ó Dorcháin.
Patrick Woulfe had listed an Ó Dorcháin surname associated with forms including Dorgan and Dorrigan and had suggested a relationship with Ó Dorchaidhe.
Jerry questioned that interpretation.
He examined the proposed Irish roots, the known geographic associations of Ó Dorchaidhe, and the absence of a known historical Cork family of that name corresponding to the Dorgans.
Jerry concluded that Ó Dorcháin was not the ancestral Irish surname of Bill’s Dorgan family.
He suggested that the form may have arisen from an attempt to Gaelicize the already altered English pronunciation “Dorgan” back into Irish.
Whatever the precise history of Ó Dorcháin, Jerry’s conclusion concerning the East Cork family remained unchanged:
Ó Deargáin — not Ó Dorcháin or Ó Dorchaidhe.
The Meaning of Ó Deargáin
The surname Ó Deargáin means a descendant of a man called Deargán.
Deargán is a diminutive associated with the Irish word dearg, meaning red.
Over time, the surname appeared in several Anglicized forms.
Among those recorded in surname scholarship are:
- Dargan
- Dergan
- Dorgan
- Dorrigan
For the East Cork family, the two forms of greatest importance are Dargan and Dorgan.
Both appear in the documented history of the family.
County Cork and the Dorgan Form
Published surname authorities noted that Dorgan became especially associated with County Cork.
The place-name Ballydorgan in County Cork also preserves the surname.
The Dargan spelling became more strongly associated with Leinster and the Irish midlands, while Dorgan became characteristic of Cork.
This regional development helps explain why members of the Carrigkilter family can appear as Dargan in earlier records and Dorgan in later records without representing two separate family lines.
Jerry Kelly’s Discovery in the Early Irish Genealogies
Jerry’s contribution went well beyond identifying Ó Deargáin as the original Irish form of the Dorgan surname.
In later correspondence, he returned to the subject with what he described as a remarkable discovery concerning the Uí Dheargáin in Ireland’s early genealogical tradition.
Because Jerry’s explanation is an important part of the history of this research, his account is preserved here substantially in his own words.
Jerry Kelly’s Account
Jerry wrote to Bill:
Dear Bill,
I’ve discovered something about your family that I think is truly remarkable and a testament to your ancestors’ determination and persistence over the last 2,000 years.
As Celtic population groups and Celtic culture spread into Ireland, the earlier Bronze Age populations gradually became Celtic as well. The Celts are a cultural and linguistic group, not a race, which is why we have such a variety of Irish types.
Up until roughly the 8th century, when a large and powerful tribe conquered a territory, the older population groups were sometimes given invented genealogies that made them part of the conquering tribe.
So when the Laighin conquered the area now called Leinster, they supplied Laighin genealogies to some of the Cruithin and Érainn tribes who were already there.
Some groups, however, were not absorbed in this fashion.
These Cruithin and Érainn holdouts were called forshloinnte — “external families,” meaning external to the tribe — in the Gaelic learned tradition of law, history, and genealogy.
Life was not easy for the forshloinnte. They were driven off the best land, heavily taxed, and sometimes forced into exile. They suffered worst in times of war and famine, and over time their numbers declined sharply
Yet a very few insisted on holding on, holding out, and even flourishing.
In honor of your ancestors, I note the following entries in our Seanchas about your family and your tribe:
Jerry then quoted two early genealogical sources.
From the medieval manuscript Rawlinson B.502:
Forsluinti iomorro Húa Lugdach meic Thuathail Tigich: Húi Dile deogbaire dia tát Húi Derggáin, Húi Gumáin, Húi Síláin Chrecóra.
And from The Book of Genealogies compiled by Dubhaltach Mac Fhirbhisigh in 1650:
Forshloinnte Ua Lugdhach, .i., Uí Didli deogbair, dia ttáid Uí Dheargáin, Uí Gomain, agus Uí Shíoláin Crecora.
Jerry translated the passage:
External families in the territory of the Uí Lughdhach Mhic Thuathail Thighich — the Uí Dhile Dheogbhaire, the descendants of Dil the cupbearer, from whom are the Uí Dheargáin, Uí Gomain, and the Uí Shíoláin of Crecóra.
Jerry continued:
Here we see that not only did your family survive, but they also managed to maintain their tribal genealogy and affiliations in opposition to the conquering Laighin — an extraordinary achievement.
Jerry then considered the possible deeper origin of the group represented in these genealogical traditions.
He wrote that the surviving entries did not themselves determine whether the Uí Dhile Dheogbhaire were originally Cruithin or Érainn.
He nevertheless found several associations of the name Dil / Díl / Dila with Érainn genealogical traditions and concluded that, in his interpretation, the group was probably of Érainn origin.
He closed:
I hope that’s helpful.
Le gach dea-mhéin / Best,
Jerry
What Jerry’s Discovery Establishes — and What It Does Not
Jerry’s discovery is significant.
The medieval and early-modern genealogical texts he identified demonstrate that forms of the name Uí Dheargáin existed within Ireland’s Gaelic genealogical tradition long before the modern Dargan and Dorgan spellings appeared.
They also preserve an old tradition associating the Uí Dheargáin with the Uí Dhile Dheogbhaire and with families described as forshloinnte.
Jerry interpreted those entries as evidence for a remarkably ancient history of the family name.
His account deserves to be preserved as he gave it.
At the same time, this website makes an important genealogical distinction.
No documentary chain has yet been established connecting Patrick Dargan / Dorgan of Carrigkilter, generation by generation, to the Uí Dheargáin named in Rawlinson B.502 or in Mac Fhirbhisigh’s Book of Genealogies.
The ancient sources establish the historical presence and antiquity of the Uí Dheargáin name and genealogical tradition.
The documented Carrigkilter family history begins many centuries later and must continue to be reconstructed from surviving parish registers, land records, deeds, valuation material, civil records, cemetery evidence, and other contemporary sources.
The two bodies of evidence are therefore presented together, but not confused:
Jerry Kelly’s research illuminates the ancient history of the name Ó Deargáin.
The Carrigkilter research seeks to establish the documented ancestry of Patrick Dargan / Dorgan and his descendants.
If evidence someday bridges those histories, it will be added here.
Until then, Jerry’s remarkable account stands on its own as an important chapter in the history of the Dorgan name.
Why Jerry Kelly’s Contribution Matters
Jerry Kelly gave the Dorgan research something more valuable than a simple surname translation.
He explained why the forms Dargan and Dorgan occur.
He examined competing Irish-language forms rather than simply repeating them.
He connected the surname with major authorities on Irish family names.
He also directed attention to early Irish manuscript evidence showing that forms of Uí Dheargáin existed in the Gaelic genealogical tradition centuries ago.
His correspondence helped make sense of something visible in the family’s own nineteenth-century records: the gradual movement from Dargan toward Dorgan.
That insight remains important every time another East Cork record is examined.
A Research Legacy
Jerry’s correspondence arrived in 2005, during an important period in the effort to reconnect the American Dorgan family with its East Cork origins.
More than twenty years later, his explanation continues to guide the project.
When an early record says Dargan, it is not dismissed because later generations used Dorgan.
When an Irish form of the surname is needed, Ó Deargáin is used.
And when much older historical references to the surname are discussed, they are kept distinct from the proven Carrigkilter family tree unless documentary evidence can bridge the generations.
That combination of linguistic knowledge, historical context, and genealogical caution is Jerry Kelly’s lasting contribution to this project.
In Appreciation
This page is dedicated to Jerry Kelly in appreciation for the time, knowledge, and scholarship he shared with William J. Dorgan III during the family research.
His correspondence helped answer a question that had followed the family through generations of records:
Dargan or Dorgan?
The answer is that both belong to the family’s documentary history.
Behind them stands the older Irish name: Ó Deargáin
Research Sources
Jerry Kelly correspondence with William J. Dorgan III
11 June 2005
Subject: DORGAN/O'DORCHAIN or DARGAN/O'DEARGAIN?
Additional Jerry Kelly correspondence concerning early Irish genealogical references to Uí Dheargáin.
Authorities and sources discussed by Jerry Kelly include:
- Edward MacLysaght, The Surnames of Ireland
- Brian de Breffny, Irish Family Names
- Patrick Woulfe, Sloinnte Gaedheal is Gall / Irish Names and Surnames
- Rawlinson B.502
- Dubhaltach Mac Fhirbhisigh, The Book of Genealogies
- T. F. O’Rahilly, Early Irish History and Mythology
Related Pages
Patrick Dargan / Dorgan of Carrigkilter