Taken from the 1851 census of Brechin.
"Catherine Allan, wife of William Allan, born about 1813, St Cyrus, Kincardine, age 38, Civil Parish, Brechin, Town, Brechin, Address, Upper Wynd.
William Allan, husband of Catherine Allan, born about 1806, St Cyrus, Kincardine, age 45, Civil Parish, Brechin, Town, Brechin, Address, Upper Wynd."
William Allan, b 23 October 1808, St Cyrus, Kincardineshire.
Catharine Carnegie, b 24 June 1811, Fordoun, Kincardineshire.
Catharine Carnegie, b 24 July 1812, Fordoun, Kincardineshire. (TWO ENTRIES).
No births for the spelling of Catherine between 1800 and 1820, for the whole of Kincardineshire.
Regards
Malky