Mark Otteley to John Outram - 1881 Census household returns
- Mark Otteley to Elizabeth Otter
- Elizabeth Otter to Henry Otter
- Henry Otter to Joseph A Otter
- Louisa Otter to William Otter
- William Otter to William Otterburn
- William Otterburn to Sarah Otterwill
- George Ottery to Joseph Ottewell
- Maria Ottewell to Thomas Ottey
- Thomas Ottey to George P Ottley
- George W Ottley to Walter Ottley
- Warner Ottley to Thomas Otto
- Wilhelmina Otto to Charles Ottoway
- Edward Ottoway to William Ottway
- William Ottway to Thomas Otty
- Thomas Otty to James Otway
- John Otway to Albert Otz
- Hans Oua to Eliza Ough
- Francis Ough to Margaret Oughterlonie
- George Oughterson to George F Oughton
- George W Oughton to R Oughton
- Ralph Oughton to William Oughton
- William Oughton to Eliza Ould
- Elizabeth Ould to Thomas Ould
- Thomas P Ould to Edward Oulram
- Mary Oulsen to John Oulton
- John Oulton to Frederick Oultram
- George Oultram to John Ourner
- Joseph Ourns to Mary Ouseley
- Reginald Ouseley to William J Ousey
- William Ousgood to Charles E Ouston
- David Ouston to Thomas Outen
- Thomas Outen to Edward Outhet
- Edwin C Outhet to Elizabeth Outhwaite
- Ellen Outhwaite to John Outhwaite
- John H Outhwaite to Thomas Outhwaite
- Thomas Outhwaite to Edward Outing
- Fanny Outing to John Outlaw
- John Outlaw to Antoine Outram
- Arthur Outram to George Outram
- George Outram to John Outram