Please see media for document indicating descent from Charles Marsh/Susan Arnold Marsh. On the other hand, Dwight Marsh's Marsh Genealogy Giving Several Thousand Descendants of John Marsh of Hartford, Ct. lists but two Cyruses; one of them (no. 3364) is not a possibility. The other (no. 477), however, is given as the son of George Marsh and Catherine Kilbourn.
As a 3g grandson of Cyrus Wilson Marsh, my DNA matches include—as potential cousins in the appropriate degree—other descendants of Catherine Kilbourn.