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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|
| Oesterreich, Von | 56 | Orvis | 13 | Oranien, von | 1 | Ocington | 1 | Obotrites | 1 |
| Oldenburg | 15 | Overton | 1 | Ott | 4 | Oiler | 6 | Olafsson | 2 |
| Ogilvy | 3 | Oliver | 1 | Ochs | 1 | Oilly, von | 8 | Oda | 2 |
| Oesterreich-Tuscany, von | 1 | Onfroi | 1 | Oppersdorf, von | 1 | Oettingen, von | 1 | Oneca | 1 |
| Orange, von | 7 | Obermayer | 2 | Orlamuende, von | 3 | Oberlothringen, von | 1 | Osorez | 1 |
| Orleans, von | 12 | Orton | 4 | Owen | 10 | Othelhildis | 1 | Offaly, von | 2 |
| Oldenburg, von | 1 | Ordel | 1 | Ourada | 1 | Ober-Lothringen, von | 1 | Other | 1 |
| Oettingen-Oettingen, von | 1 | Ooley | 3 | Ordlock | 1 | Ouilly, von | 1 | Outlaw" | 1 |
| Ostfriesland, von | 1 | Orr | 6 | Osburga | 2 | Ostmark, von | 1 | Oviedo, de | 1 |
| Obelensky | 1 | Oilly, D' | 1 | Oeren, von | 1 | Oisy, von | 3 | Ollyver | 1 |
| Olga | 3 | Oppen, von | 2 | Ocanny | 2 | Osbeorne | 1 | Oechlingen | 1 |
| Osborne | 1 | Obotrites, von | 2 | Oxendine | 3 | Oosterwijk, Van | 1 | Osbern | 1 |
| Owain | 4 | Orreby | 2 | Oney | 1 | Omer, St. | 1 | Ochsenstein, von | 1 |
| Osburh | 1 | Oakley | 2 | Ovesen | 3 | Ortenburg, von | 1 | Oppell, von | 1 |
| Onley | 1 | Ortiz, Senor De Zuniga | 1 | Obelitz | 1 | Oldrich, Boehmen | 1 | Ostfrisland, von | 1 |
| Outre-Mer, von | 1 | Ordonez De Aza | 1 | Olivia | 1 | Ota I , Duke Moravia | 1 | Ogle, von | 1 |
| Oscar | 3 | Odile | 1 | Olsen,(Bookkeeper, Godsforvalter) | 1 | Olivetti | 1 | Orkney, von | 1 |
| Ollen | 1 | Oulbegian | 6 | Olufsdatter | 1 | Ortiz | 1 | Oxford, von | 1 |
| Ovchinnikov | 1 | Olson | 3 | Olsen, (Died In Childbirth) | 1 | Ochoa | 1 | Ormonde | 1 |
| Otto | 1 | Owens | 4 | Oksen | 2 | Oberhoff | 1 | Oesterreich, Kg. v. Ungarn, von | 1 |
| Oesterreich-Este, von | 1 | Ohrt | 1 | Offersen | 1 | Ortega | 1 | Owen, Jr | 1 |
| Ogston | 1 | Ogilvie | 1 | One | 3 | Olington | 1 | Orton, Sergeant | 1 |
| Oldenberg, von | 1 | Olsen | 4 | Olsen, Secretary | 1 | Osraige, von | 11 | o`Mara | 1 |
| Oliveira | 2 | Otten | 1 | Oceguera | 5 | Odba | 1 | - | - |
