Patrick Obrien to Charles Odell - 1911 Census household returns
- Patrick Obrien to Thomas Obrien
- Thomas Obrien to William Obrien
- William Obrien to Margaret Obryan
- Mary Obryan to Thomas Ocallaghan
- William Ocallaghan to John Occleston
- John Occleston to Alfred Charles Ochiltree
- Earnest William Ochiltree to George Ockelford
- George Ockelford to Charles Ockenden
- Charles Ockenden to George Ockenden
- George Edmund Ockenden to Maurice Albion Ockenden
- Morris William Ockenden to Charles E Ockendon
- Edwin Ockendon to William Ockey
- William T Ockey to Maria Ockleston
- Mary Ockleston to Edward Ockwell
- Edwin Ockwell to Sarah Ockwell
- Sono Blanche Ockwell to Fanny Ocock
- Florrie Anne Ocock to Mary Ann Oconnell
- Maud Kate Oconnell to Edward Oconnor
- Edward Oconnor to John Oconnor
- John Oconnor to Patrick Oconnor
- Patrick Oconnor to Charles Ocraft
- Ernest Ocraft to Henry Odam
- Henry John Odam to Charles H Odams
- Charles Mr Odams to William Odber
- Abraham Odd to Walter Odd
- Walter William Odd to Annie Oddie
- Annie Oddie to Herbert Oddie
- Herbert Oddie to Joseph Oddie
- Joseph Oddie to Wilkinson Oddie
- William Oddie to Alfred Oddy
- Alfred Oddy to Charles Oddy
- Charles Oddy to Eliza Oddy
- Eliza Oddy to Fred K Solomon Oddy
- Fred W Oddy to Hannah Oddy
- Hannah Jane Oddy to Herman Oddy
- Imerah Oddy to Jesse Oddy
- Joe Oddy to John Lonsdale Oddy
- John Lupton Oddy to Martha Oddy
- Martha Ann Oddy to Rufus Oddy
- Ruth Oddy to Sarah Jane Oddy
- Saville Oddy to Walter James Oddy
- Walter Stanley Oddy to William Thomas Oddy
- William Vivian Oddy to Alfred Odell
- Alfred Odell to Arthur Odell
- Arthur Odell to Charles Odell