| Surname | Individuals |
|---|---|
|
O'Bryan
|
4 |
|
O'Connor
|
2 |
|
O'Donnell
|
1 |
|
O'Malley
|
2 |
|
O'Rourke
|
5 |
|
Oberle
|
4 |
|
Ochs
|
6 |
|
Offenloch
|
1 |
|
Ofrizzer
|
1 |
|
Ohl
|
1 |
|
Ohlemacher
|
51 |
|
Older
|
1 |
|
Olesinski
|
9 |
|
Olewine
|
2 |
|
Olmstead
|
3 |
|
Olsavsky
|
2 |
|
Olsen
|
2 |
|
Olwill
|
3 |
|
Ommert
|
4 |
|
Ontko
|
3 |
|
Onyock
|
3 |
|
Opperman
|
2 |
|
Ora
|
1 |
|
Orr
|
2 |
|
Orshoski
|
4 |
|
Ortez
|
1 |
|
Ortolani
|
10 |
|
Osborn
|
1 |
|
Osenbaugh
|
1 |
|
Osmond
|
1 |
|
Osterland
|
1 |
|
Ostheimer
|
1 |
|
Oswald
|
1 |
|
Ott
|
1 |
|
Ouabankikove
|
1 |
|
Overcasher
|
7 |
|
Overholser
|
2 |
|
Overmyer
|
11 |