O'Hearn History, Family Crest & Coats of Arms
Many Irish surnames can be traced back to their Gaelic forms. The name O'Hearn originally appeared in Gaelic as O hEachthigheirn or O hEachthigheirna, made up of the words "each" meaning "steed," and "thighearna," meaning "lord." This was first Anglicized O'Hagherin, which was later changed to O'Aherne before the prefix was eventually dropped. 
Early Origins of the O'Hearn family
The surname O'Hearn was first found in County Clare (Irish: An Clár) located on the west coast of Ireland in the province of Munster, where they held a family seat as a Dalcassian sept from before the year 1000. However, with the disruptions of the Strongbow Invasion of 1172, they migrated southward to counties Cork and Waterford. In Waterford the name is predominantly Hearn and Hearne.
Early History of the O'Hearn family
This web page shows only a small excerpt of our O'Hearn research. Another 116 words (8 lines of text) covering the years 1420, 1566, 1754, 1769, 1797, and 1806 are included under the topic Early O'Hearn History in all our PDF Extended History products and printed products wherever possible.
O'Hearn Spelling Variations
The recording of names in Ireland in the Middle Ages was an inconsistent endeavor at best. The standardized literary languages of today were not yet reached the general citizenry. Research into the name O'Hearn revealed spelling variations, including O'Aherne, O'Ahern, Hearne, O'Heffron, Haveran, Hayveren and many more.
Early Notables of the O'Hearn family (pre 1700)
More information is included under the topic Early O'Hearn Notables in all our PDF Extended History products and printed products wherever possible.
In the United States, the name O'Hearn is the 14,804th most popular surname with an estimated 2,487 people with that name. 
Emigration to Australia followed the First Fleets of convicts, tradespeople and early settlers. Early immigrants include:
O'Hearn Settlers in Australia in the 19th Century
The motto was originally a war cry or slogan. Mottoes first began to be shown with arms in the 14th and 15th centuries, but were not in general use until the 17th century. Thus the oldest coats of arms generally do not include a motto. Mottoes seldom form part of the grant of arms: Under most heraldic authorities, a motto is an optional component of the coat of arms, and can be added to or changed at will; many families have chosen not to display a motto.
Motto: Per ardua surgo
Motto Translation: I rise through difficulties.