I am descended from John IBBOTT (b.1836 in Coppingford). He married Elizabeth UNDERWOOD, 31 Jan 1853, in Upton. Elizabeth had a child prior to marriage, George William UNDERWOOD (b. 1852). John and Elizabeth had 3 children, James Samuel IBBOTT (b.1859), Emily Louisa IBBOTT (b.1862) and Harriett Elizabeth HIBBERT (b.1867). According to family stories and backed up by birth and census records, the family changed their surname between 1862 and 1867. I am looking for information on WHY they did this. I would also like info on the IBBOT line in the Coppingford, Sawtry and Somersham area.