Pardon if I only end up adding to your confusion, but I couldn't help but wonder about this - apparently a generation earlier:
1841 Kerrier-Cornwall, Budock Address: Basset Street
LAVIN Edward M 45 Ag Lab Cornwall LAVIN Edward M 15 Cornwall LAVIN Mary F 15 Cornwall WARREN William M 30 Mariner Cornwall TEYREEN Eliza F 30 Female Servant Cornwall
William Warren, m 1841 Falmouth, Mary Barnicoat. They were my ggg g/p's.
1841 - Budock St, Budock, Cornwall
BARNICOAT John M 60 Wheelwright Cornwall BARNICOAT John M 25 Mason Cornwall BARNICOAT James M 2 Cornwall BARNICOAT Amelia F 17 Cornwall WARREN Mary F 24 Lodger (Crossed Out) Cornwall
John Barnicoat b abt 1781 m 1800 Eleanor Nicholas. There is an Eleanor Barnicoat death in the BMD for 1839 Falmouth. I presusme this is her. There are also about a half dozen other potential siblings for John and Mary, all children of a John Barnicoat and Eleanor/Ellen: Eliza 1805, another Mary 1810, Henry 1815, Frederick 1820, and Amelia abt 1820.
I'm thinking "Teyreen" is a variant of Trewin. Don't know if this helps. cheers Pat