My grandfather, John O'Connell, was born 20 March, 1887 in Ballyhooly, County Cork however, most of his U.S. documents state that he was born 17 March, 1887. At some point after moving to the US he began telling everyone that his birthday was St. Patrick's Day. There is only one reason for this, he was fiercely proud of his Irish heritage, but it can make for some confusing research.