First found in Connacht, where they were seated from ancient times.

Thousands of Irish Families left for North American shores in the 19th century. These people were searching for a life unencumbered with poverty, hunger, and racial discrimination. Many arrived to eventually find such conditions, but many others simply did not arrive: victims of the diseased, overcrowded ships in which they traveled to the New World. Those who lived to see North American shores were instrumental in the development of the growing nations of Canada and the United States. A thorough examination of passenger and immigration lists has disclosed evidence of many early immigrants of the name O'Beirne: Bridget Birne, who sailed to Quebec in 1849; Michael Beirne to Philadelphia in 1867; Patrick Beirne to Philadelphia in 1869; Martin Beirn to Philadelphia in 1872.

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