First found in county Kerry, where they held a family seat 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'Shea: Daniel, James, John, Patrick, Thomas McShea all arrived in Philadelphia between 1840 and 1860; Bartholomew, David, Edward, Lawrence, James, John, Michael, Timothy O'Shea all arrived in Philadelphia between 1840 and 1860..

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