While reviewing most of the posts below, I believe we need to be more specific for the documentation we need. Exactly: we need to locate documents to verify White's statement and conclusion that Catheys came directly to America from Scotland and that the madiden name for the wife of George Cathey was McKinley.
White gives what he believes is accurate data on four or so Catheys. We have not had enough time to verify the accuracy of his assertations. These names are not relevant to support some of his conclusions.
Other than a general reference to the "open" Maryland Archives we really do not know where to go. Or to verify a pseudo name James Robert Catheye. There are NO, allow me to repeat, NO name CATHEYE in any of the sources he quotes.