The earliest traceable one in this family is Hugh Corsie born c1770. He married Christian Sinclair, a sister of Archie Sinclair. Their son Malcolm, born 1798, married Isabella Louttit. and a daughter of theirs married John Robertson of Banks in Frotoft. Their son William Corsie, 1830-1917, married Ann Leonard from Digro, Rousay.
John Corsie of Knarston, Rousay, a son of William and Ann above, married Margaret Skethaway. They are seen with their children in the photo below.
There were also Corsie families in the district of Frotoft. The earliest traceable member of one of the Corsie families of Frotoft was James Corsie who married Christian Louttit of Cotafea in 1798. Their son Alexander (1819-1898) married Ann Sinclair from Tratland. John Corsie, a son of Alexander and Ann, married Margaret Craigie from Mount Pleasant.