I believe all IXER's on the 1851 UK census and after can be traced to one of three marriages.
1/ Samuel Ixer 1762 - 1814 married 27-04-1782 Copdock, Suffolk to Susan Aldis 1760 - 1813
2/ Samuel Ixer 1752 - 1829 married 22-01-1790 St Nicholas, Ipswich to Elizabeth Howes 1753 - 1830
3/ Thomas Ixer 1773 - 1858 married 03-02-1807 Chelmsford, Essex to Ann Baker 1778 - 1847.