The Mouser name is either an occupational name for a vermin controller, or more likely in the Middle Ages was a nickname. It is found primarily in the East Anglia, specifically Norfolk and Suffolk.

Current research identifies the earliest known ancestor of our Mouser line as being William Mouser of Suffolk. Williams great great grand-daughter Lucy Mouser married John Jessop who emigrated to Australia in 1838 after her death.

The Mouser ancestry goes back 11 generations and biographies exist for some members as indicated by links

• William Mouser married Elizabeth
  • William Mouser 1721 married Mary Andrews
    • William Mouser 1746 - 1827 married Hannah Flatman
      • William Mouser 1771 - 1824 married Lucy Cullingford
        • Lucy Mouser 1795 - 1836 married John Jessop 
          • John Jessop 1834 - 1906 married Sarah Ann Burgess 
            • John Crofton Jessop 1861 - 1910 married Hannah Shoobridge
              • Sydney Walter Jessop 1887 - 1973 married Emily Louisa McDermott
                • Esmond Earl Jessop 1915 - 2000 married Mary Agnes Darrough
                  • My Mother