I am researching my Dillon line. My ggg-grandfather, Arthur Dillon came to the US through NY. He said he stowed away on a ship, that he was from King's county. I have a letter his cousin Ellen Dillon wrote him from Ireland which mentions names of HER siblings Willliam, John, Edward, Arty, and Fanny. Arthur may had at least one brother that came to the US, Edward Dillon Sr, who married Maggie Fitzgerald.
Any information will help!