Hi, Just because there is no Cordiner is this person's ancestry doesn't mean the name is wrong. There is a James Duff Ogg, born in Aberdeenshire (10/01/1823). There are no Duffs in the Ogg family (my husband's family).. James was named for the person who owned the estate the Ogg croft was on. There is a Robert Gardner Duff born in Perthshire on 05/09/1841. There is no Gardner ancrestry in the Duff family (my family).. We still haven't found where the Gardner came from. So the middle name does not necessarily have to be in the family ancestry. Kathy