| Surname | Spouses |
|---|---|
|
O'Brien
|
1 |
|
O'Connel
|
1 |
|
O'Connell
|
1 |
|
O'Connor
|
1 |
|
O'Dea
|
1 |
|
O'Donnell
|
2 |
|
O'Farrell
|
1 |
|
O'Keefe
|
1 |
|
O'Lachlan
|
1 |
|
O'Loughlin
|
1 |
|
O'Neill
|
1 |
|
O'Toole
|
1 |
|
Oakes
|
4 |
|
Oakman
|
1 |
|
Oatey
|
5 |
|
Obst
|
50 |
|
Odewahn
|
8 |
|
Offen
|
1 |
|
Oliver
|
4 |
|
Oniper
|
1 |
|
Orchard
|
3 |
|
Ortlip
|
1 |
|
Osborne
|
2 |
|
Osmond
|
1 |
|
Osterburg
|
1 |
|
Ottens
|
1 |
|
Otto
|
19 |
|
Otway
|
1 |
|
Oughton
|
6 |
|
Oxley
|
1 |
|