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

There art two possible origins of the Irish surname O'Blak. The first is that it originated from the Gaelic "O Blathmhaic," which translates as "descendant of Blathmhac," a personal name for the Gaelic "blath" meaning "flower", "blossom", "fame", "prosperity." The second was that the name could have been derived from the Old English word "blaec" meaning "dark" or "swarthy."

Early Origins of the O'Blak family

The surname O'Blak was first found in Connacht (Irish: Connachta, (land of the) descendants of Conn), where the Blake family were one of the Tribes of Galway, descending from Richard Caddell (le Blac), sheriff of Connacht in 1303, who came to Ireland with Prince John in 1185, and used both the surnames Caddell and Blake. 1

The name Caddell is Welsh, and means "warlike." It was not replaced completely by Blake until the 17th century, and for three hundred years, people with these surnames were referred to in municipal records by both names.

"The Blakes of Ireland descend from Richard Blake, who accompanied Prince John to that country in 1185, and settled in co. Galway." 2 Richard Caddle was sheriff of Connaught in 1306 A.D. and was a tenant of Falway under Richard de Burgo (Burke), the Red Earl of Ulster.

Early History of the O'Blak family

This web page shows only a small excerpt of our O'Blak research. Another 97 words (7 lines of text) covering the years 1611, 1708, 1738, 1745, 1774, 1780, 1797, 1818 and 1849 are included under the topic Early O'Blak History in all our PDF Extended History products and printed products wherever possible.

O'Blak Spelling Variations

The spelling of names in Ireland during the Middle Ages was rarely consistent. This inconsistency was due to the scribes and church officials' attempts to record orally defined names in writing. The common practice of recording names as they sounded resulted in spelling variations such as Blake, Caddell, Caddle and others.

Early Notables of the O'Blak family

Notable amongst the family name at this time was Sir Francis Blake (1708-1780), 1st Baronet, mathematician, descended from the house of Menlough, co. Galway. His father, Robert Blake, by his marriage with Sarah, third daughter of his kinsman, Sir Francis Blake, knight, of Ford Castle, Northumberland, became possessed of the Twisell estate, in the county of Durham...
Another 56 words (4 lines of text) are included under the topic Early O'Blak Notables in all our PDF Extended History products and printed products wherever possible.

Migration of the O'Blak family

The 19th century saw a great wave of Irish migrating out of their homeland in a great measure due to the oppressive imperial policies of the English government and landowners. Many of these Irish families sailed to North America aboard overcrowded passenger ships. By far, the largest influx of Irish immigrants to North America occurred with Great Potato Famine during the late 1840s. These particular immigrants were instrumental in creation of the United States and Canada as major industrial nations because the many essential elements such as the roadways, canals, bridges, and railways required an enormous quantity of cheap labor, which these poor immigrants provided. Later generations of Irish in these countries also went on to make valuable contributions in such fields as the arts, commerce, politics, and education. Extensive research into immigration and passenger lists has revealed many early immigrants bearing the name O'Blak: William Blake who came from Essex, England, sailed on the "Mary and John" in 1630 and settled in Dorchester, Massachusetts; George Blake settled in Gloucester in 1640.



  1. MacLysaght, Edward, Supplement to Irish Families. Baltimore: Genealogical Book Company, 1964. Print.
  2. Lower, Mark Anthony, Patronymica Britannica, A Dictionary of Family Names of the United Kingdom. London: John Russel Smith, 1860. Print.


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