Joseph O Harrow to John O'brien - 1881 Census household returns
- Joseph O Harrow to Moses O Keef
- Arthur O Keefe to Jeremiah O Keeffe
- John O Keeffe to Thomas O Lachlin
- John O Larry to Jeremiah O Leary
- Johanah O Leary to Thomas O Leary
- Timothy O Leary to Charles O Malley
- Charles O Malley to John O Mara
- Michael O Mara to John O Neal
- John O Neal to Bernard O Neil
- Bernard O Neil to George J O Neil
- Hannah O Neil to James O Neil
- James O Neil to John O Neil
- John O Neil to Patrick O Neil
- Patrick O Neil to William O Neil
- William O Neil to Charles O Neill
- Charles O Neill to Ida O Neill
- J H O Neill to Joseph O Neill
- Julia O Neill to Peter O Neill
- Peter O Neill to James O Niel
- James O Niel to Thomas O Niell
- William O Niell to William O Reilly
- William O Reilly to James O Rourke
- James O Rourke to Hannah O Shea
- James Michael O Shea to Maria C O Sullivan
- Martin O Sullivan to Peter J O' Hanlon
- Michael O' Neile to John O'boyle
- John O'boyle to Cornelius O'brian
- Cornelius O'brian to Johanna O'brian
- John O'brian to Mary O'brian
- Mary O'brian to Thomas O'brian
- Thomas O'brian to Andrew O'brien
- Andrew O'brien to Catherine O'brien
- Catherine O'brien to Daniel O'brien
- Daniel O'brien to Edward O'brien
- Edward O'brien to Ellen O'brien
- Ellen O'brien to Henry O'brien
- Henry O'brien to James O'brien
- James O'brien to James O'brien
- James O'brien to Johanna O'brien
- John O'brien to John O'brien