| Surname | Individuals |
|---|---|
|
O'Brien
|
10 |
|
O'Connor
|
1 |
|
O'Farrell
|
1 |
|
O'Flyn
|
1 |
|
O'Hara
|
1 |
|
Oaks
|
1 |
|
Oatman
|
1 |
|
Oestreicher
|
1 |
|
Offutt
|
5 |
|
Ogden
|
1 |
|
Ojen
|
1 |
|
Oldakowska
|
1 |
|
Olden
|
1 |
|
Oldershaw
|
1 |
|
Olds
|
1 |
|
Olean
|
1 |
|
Olmstead
|
3 |
|
Olmsted
|
1 |
|
Olsen
|
2 |
|
Olson
|
15 |
|
Omo
|
1 |
|
Opdehl
|
1 |
|
Ordway
|
1 |
|
Orlando
|
1 |
|
Orr
|
1 |
|
Orson
|
1 |
|
Orth
|
2 |
|
Orton
|
9 |
|
Osborn
|
4 |
|
Osborne
|
1 |
|
Osgood
|
6 |
|
Osterhandt
|
1 |
|
Ostrander
|
1 |
|
Ostranger
|
1 |
|
Oswald
|
1 |
|
Otey (Odie?)
|
1 |
|
Otis
|
1 |
|
Ouderkirk
|
1 |
|
Overstreet
|
1 |
|
Oviatt
|
9 |
|
Owen
|
12 |
|
Owens
|
5 |
|
Oyer
|
1 |