I'm not sure if we have a connection, but I have a Farrell and Guilfoyle in my family tree. My g-grandfather is Joseph Farrell, who emigrated to Philadelphia around 1880. His marriage certificate, in 1880, lists him as "Peter O'Farrell", but he later began calling himself Joseph Farrell. He was my mother's grandfather, but she had little information on him. His mother's name was Rose Guilfoyle, and he had a sister Delia Farrell (which I've been told is a nickname for Bridget). I can't seem to find his name on any immigration records, or birth records. I do have an obituary for him from 1936, but it does not list his parents. I have his death certificate, which lists his mother as "Rose Gilfile". I would like to know where in Ireland he came from. I found a marriage record for a Rose Guilfoyle in Parsonstown Ireland, but her husband's name is Fieharry, not Farrell. I noticed your information is from a parish in NY. Do you have any information on where your Farrells and Guilfoyles came from in Ireland?