| Surname | Individuals |
|---|---|
|
O'Brien
|
2 |
|
O'Dell
|
1 |
|
O'Drowsky
|
1 |
|
O'Larey
|
1 |
|
O'Neill
|
3 |
|
Ochala
|
1 |
|
Ogibowski
|
1 |
|
Ohmer
|
4 |
|
Oliver
|
5 |
|
Olivier
|
3 |
|
Olivieri
|
1 |
|
Olsen
|
1 |
|
Ondrej
|
1 |
|
Ondrusova
|
1 |
|
Opacstova
|
1 |
|
Orange
|
1 |
|
Orlebar
|
1 |
|
Orlow
|
1 |
|
Orman
|
7 |
|
Ormand
|
1 |
|
Ormerod
|
13 |
|
Ormond
|
2 |
|
Ormrod
|
1 |
|
Orsava
|
3 |
|
Orsavova
|
2 |
|
Osborne
|
10 |
|
Ovari
|
2 |
|
Ovariova
|
1 |
|
Overton
|
2 |
|
Owens
|
1 |
|
Owensby
|
10 |
|
Ozmun
|
5 |