First found in county Cork, where they were seated from very ancient times, some say well before the Norman Conquest and the arrival of Duke William at Hastings in 1066 A.D.

Irish Families fled the English-colonized Ireland in record numbers during the 19th century for North America. Many of those destitute families died from disease during, and even shortly after, the long journey. Although those that immigrated before the Great Potato Famine of the 1840s often were granted a tract of land, those that arrived later were generally accommodated in urban centers or in work camps. Those in the urban centers would labor in the manufacturing sector, whereas those in work camps would to build critical infrastructures such as bridges, canals, roads, and railways. Regardless of when these Irish immigrants came to North America, they were critical for the rapid development of the young nations of the United States and Canada. Early immigration and passenger lists have recorded many early immigrants bearing the name of Cahalan: Johannes Cronin who settled in Philadelphia in 1738; followed by James Cronin in 1787; Charles, Cornelius, Daniel, Edward, Eugene, James, John, Michael, Patrick, Thomas, William Cronin, all settled in Philadelphia, Pennsylvania between 1817 and 1868.

For more information on the last name Cahalan, the PDF Surname History is available for purchase as well as other products.