I do a lot of research on the Marsh men who came to the USA between 1633 and 1669. These included John Marsh 1633, another John Marsh 1634, George Marsh 1635, another John Marsh 1635. William Marsh 1636, Jonathan Marsh 1635, Francis Marsh 1636, Samuel Marsh 1647, Thomas Marsh 1648, and Alexander Marsh 1654. This is the prime group that came to America and the year they immigrated.
I took my Marsh ancestors back to 1774, that was Isaac Marsh 1774-1825; he died in LeRoy, Genesee, New York. I submitted my DNA and it says that I am related John Marsh, Hartford, Connecticut. John Marsh was born in England around 1618 and he arrived in the USA around 1635 at the age of 17 years old.