Gray of OH and MD

Searching for records on Isaac Gray family prior to their settling in Hardin County, Ohio.  They supposedly came to Hardin County from Franklin County Ohio.  Isaac was born in Maryland 1798.  Unable to locate anything prior to their settlement in Hardin County.  Parents unknown.  Wife is Catherine Calvert/Corbin/Corbett and could have been born DE, PA, Germany. Eldest son called her Alcy.