Behold, Jeremiah and Patrick Keogh are listed in Barretstown, Co. Kildare in Griffith's Valuation of 1853. Patrick is holding from Jeremiah, but Jeremiah does not have a house. Living with Patrick, or in another townland? There are also listings for Jeremiah in Dowdenstown, where he has affluent house.
As Shanreagh pointed out earlier, Darby is also Jeremiah. Most probably an official from elsewhere in the country back-translated Darby to Jeremiah, rather than Dermot, which would be the correct name in this case.