I have also heard about the Ireland connection in regards to John Marcy and his father being the High Sheriff. I have never seen any proof of this though. I have also heard in family folklore that the original Marcy in America was essentially kidnapped from the docks in Ireland and brought here forecfully (in other words he was brought here as a white slave). This is a little known or discussed part of American history but apparently it was very common in North America. These were not "identured servants" they were slaves. This may help explain why it seems that no one can produce a clear, undisputable, family link between the Marcy's in America and any relations in the Old Country.