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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|---|---|---|---|---|---|---|---|---|
| Ott | 2 | Olvis | 1 | Okeover | 1 | Oldham | 1 | Orrock | 2 |
| Owen | 12 | Oliver | 10 | Olden | 1 | Overton, Sr. | 3 | Oldenburg, von | 1 |
| Oglivie | 1 | Overton | 63 | Orleans, de | 3 | Overton, Jr. | 3 | Ownby | 1 |
| Owlsley | 1 | Ogleby | 1 | Overbey | 17 | Oldton | 1 | Overstreet | 1 |
| Orr | 9 | Ormiston | 1 | Owens | 3 | Oreguen | 1 | Old | 3 |
| Osborne | 12 | Oglesby | 1 | Oates | 1 | Ohningen, von | 1 | Old, Jr. | 1 |
| Ostern | 5 | Orrick | 5 | Ogilvy | 1 | Offerton, de | 1 | Ogilvie | 2 |
| Ogden | 1 | Obert | 1 | Orleans, d' | 4 | Orcheret, de | 1 | Oslyn | 2 |
| Omohundro, Jr. | 1 | Olivier, Jr. | 1 | Oaks | 1 | Osterreich, von | 9 | Ober | 1 |
| Omohundro | 4 | Opie | 1 | Osley | 1 | Otey | 1 | Oxford | 1 |
| Oberfell | 2 | Ogle | 4 | Ozley | 8 | Oldenburg | 6 | Olsson | 1 |