| Surname | Individuals |
|---|---|
|
O'Brien
|
3 |
|
O'Carroll
|
1 |
|
O'Connell
|
1 |
|
O'Conner
|
1 |
|
O'Leary
|
4 |
|
O'Neall
|
1 |
|
O'Rourke
|
4 |
|
O'Shannessy
|
2 |
|
O'Toole
|
1 |
|
Oates
|
16 |
|
Oats
|
195 |
|
Odgers
|
7 |
|
Oldman
|
2 |
|
Olds
|
152 |
|
Oliver
|
27 |
|
Oliveri
|
1 |
|
Olivey
|
3 |
|
Onley
|
1 |
|
Opie
|
51 |
|
Oppie
|
1 |
|
Oppy
|
8 |
|
Orchard
|
4 |
|
Orgias
|
3 |
|
Ornstien
|
1 |
|
Osborn
|
76 |
|
Osborne
|
54 |
|
Osmond
|
1 |
|
Ouelette
|
3 |
|
Owen
|
9 |
|
Owens
|
7 |
|
d'Oliveira
|
1 |