Show ContentsO'Kleary History, Family Crest & Coats of Arms

The name O'Kleary originally appeared in Gaelic as Ó Cleirigh, from the word "cleireach," which means "clerk" or "cleric." 1 The name denotes a descendant of Cleireach, who was born around 820 AD, and descended from Guaire the Hospitable, the famous king of Connacht.

Early Origins of the O'Kleary family

The surname O'Kleary was first found in County Galway. A descendent of Guaire, Cleireach, the namesake of the O'Clerys, was born around 820 AD, about two hundred years before hereditary surnames came into general use. 2 However, the name O'Clery first appeared around 950 AD, making it one of the earliest recorded hereditary surnames. The O'Clerys were the dominant sept in what is now the diocese of Kilmacduagh in the county of Galway, but declined in power until they were forced out of their original territory by the mid-13th century. The most important branch of the family settled in Counties Derry and Donegal and became prominent historians and poets. The branch that settled in County Cavan has seemingly all but vanished. However, the English surname Clarke has been widely substituted for O'Clery there, following the Plantation of Ulster, and many Irish Clarkes may actually be O'Clerys, rather than descendants of English settlers. Another branch is still fairly common in the counties of Kilkenny, Waterford, and Tipperary. The name is presently found mostly in Munster and Dublin.

Early History of the O'Kleary family

This web page shows only a small excerpt of our O'Kleary research. Another 96 words (7 lines of text) covering the years 1172, 1450, 1507, 1636, 1781 and 1860 are included under the topic Early O'Kleary History in all our PDF Extended History products and printed products wherever possible.

O'Kleary Spelling Variations

Up until the mid twentieth century, surnames throughout the world were recorded by scribes with little regard of spelling. Scribes recorded the name as they thought the surname should be spelt. Names, therefore, often had many spelling variations. The variations of the name O'Kleary include: Clery, Cleary, Claree, Clarey, Cleare, Clearey, Clerey, O'Cleary, O'Clery, Macchlery, Clerkin, Clark and many more.

Early Notables of the O'Kleary family

Another 42 words (3 lines of text) are included under the topic Early O'Kleary Notables in all our PDF Extended History products and printed products wherever possible.

Migration of the O'Kleary family

Many Irish families boarded ships bound for North America in the middle of 19th century to escape the conditions of poverty and racial discrimination at that time. Although these immigrants often arrived in a destitute state, they went on to make important contributions to the emerging nations of the United States and Canada. An inquiry into many immigration and passenger lists has revealed many early immigrants to North America bearing the O'Kleary family name: Thomas Clary, who arrived in the Virginia colony in 1642; George Cleary, who was on record in Barbados plantation between the years 1679 and 1680; Darby Cleary, who came to America in 1736.



  1. MacLysaght, Edward, The Surnames of Ireland. Ireland: Irish Academic Press, sixth edition, 1985. Print. (ISBN 0-7165-2366-3)
  2. MacLysaght, Edward, Irish Families Their Names, Arms and Origins 4th Edition. Dublin: Irish Academic, 1982. Print. (ISBN 0-7165-2364-7)


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