The Cleary surname derives from the Irish O Cleirigh, meaning descendant of Cleirigh — a personal name built on the old Irish word for cleric or scholar. The anglicised forms Cleary and O'Clery are the most common today, with Clery, Cleery, and the occasional O'Cleary also appearing in records. The name is associated primarily with County Roscommon and the broader Connacht province, though a distinct branch of the family — the O'Clerys of Donegal — achieved particular fame in the seventeenth century through their contribution to the preservation of Irish historical literature. For anyone tracing Irish ancestry under any spelling of this surname, the west of Ireland is almost always the natural starting point.
Where Did the Cleary Family Come From?
The O'Cleirigh family of Connacht were a Gaelic sept of County Roscommon, their presence in the province recorded from the medieval period within the political world dominated by the O'Connor kings of Connacht. Their name — derived from the word for cleric or scholar — suggests an origin in the learned and ecclesiastical traditions of early Gaelic Ireland, and it is possible that the family's ancestors were associated with the monastic or scholarly culture of the west before the hereditary surname system became fixed in the tenth and eleventh centuries.
A distinct and more celebrated branch of the O'Cleirigh family was based in County Donegal, where they served as hereditary poets and historians to the O'Donnell lords of Tír Chonaill. It was from this Donegal branch that Mícheál O'Cléirigh emerged in the seventeenth century, and his work stands as one of the greatest contributions to the preservation of Irish historical and genealogical knowledge ever made. The two branches — Connacht and Donegal — share the same root name and likely a common ancestry, though their histories diverged significantly across the medieval period.
Who Was Mícheál O'Cléirigh and Why Does He Matter?
Mícheál O'Cléirigh was a Franciscan friar from County Donegal who, in the 1630s, led a team of four scholars in compiling the Annals of the Four Masters — a monumental work that gathered and preserved the historical records of Ireland from the earliest times to 1616. Written at the Franciscan friary of Donegal between 1632 and 1636, the Annals drew on a vast range of earlier manuscripts, many of which have since been lost, making O'Cléirigh's work the primary surviving record of much of early and medieval Irish history.
The significance of this achievement is difficult to overstate. The Annals of the Four Masters preserved genealogies, historical events, obituaries of kings and scholars, and records of ecclesiastical foundations that would otherwise have been lost entirely in the upheavals of the seventeenth century. O'Cléirigh and his collaborators worked with an acute awareness that the Gaelic world they were documenting was disappearing around them — the Plantation of Ulster had already begun, and the Flight of the Earls had removed the great patrons of Gaelic learning from the scene. Those proud of their Cleary roots can explore heritage gifts including woven blankets, mugs, and home decor at the Cleary collection on Celtic Ancestry Gifts.
How Did the Clearys Experience the Plantation and Famine Eras?
The Connacht Clearys, as a Gaelic family of Roscommon, experienced the Connacht Plantation of the late sixteenth century and the Cromwellian settlements of the 1650s as successive waves of disruption to the Gaelic landowning and learned class structure. By the eighteenth century, Cleary families across Connacht were concentrated in the farming communities of Roscommon and the surrounding counties, maintaining their family identity without the institutional framework of the Gaelic order that had once sustained the O'Cleirigh learned tradition.
The Great Famine of the 1840s struck County Roscommon severely, and Cleary families emigrated in significant numbers to Britain, the United States, and Australia during and after the famine years. If you would like to explore Cleary heritage gifts, use the search bar above to find your name. The O'Connor family of Connacht, the great royal dynasty within whose provincial world the Clearys of Roscommon existed, provides essential context for the medieval landscape from which the Connacht branch of the name emerged. The Flanagan family of County Roscommon were among the nearest Gaelic neighbours of the Clearys in the west midlands, their shared county shaped by the same O'Connor political world and the same famine emigration experience.
Where Is the Cleary Name Found Today?
Within Ireland the Cleary surname is found in greatest concentration in County Roscommon and across Connacht, with the O'Clery form more closely associated with County Donegal and the northwest. The diaspora spread it widely across the English-speaking world, and Irish-American Cleary families are found in communities with strong Connacht Irish roots across the northeastern United States. For ancestry researchers, the civil registration records from 1864, the 1901 and 1911 census returns, and the Griffith's Valuation of the 1840s and 1850s are the essential starting tools. Establishing whether the family in question belongs to the Connacht or Donegal branch is an important early step in Cleary genealogical research.
If you are proud of your Cleary heritage, you can explore gifts and home decor featuring the Cleary name by using the search bar above. We carry thousands of Scottish and Irish surnames across a wide range of products, helping families celebrate their heritage every day. Browse the full range of Cleary heritage gifts at Celtic Ancestry Gifts — including woven blankets, mugs, and home decor items for families proud of their Connacht and Donegal roots.
Carry a different surname? Many families connected to the Cleary name through marriage, the O'Connor lordship, or the broader Connacht heritage carry other names entirely. Use the search bar above to find gifts and home decor for your own family name.
