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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|
| Osburga | 1 | Oreguen | 1 | OSORKON | 3 | Oeren, De | 1 | Osborne | 2 |
| Odgiva | 1 | OGLE | 16 | OLD | 1 | Oeren, Von | 1 | Oyly, D' | 1 |
| Olafsson | 7 | Owain Gwynedd | 1 | Ostrogoths | 1 | Olybrius | 1 | Oleg | 1 |
| Ottarsson | 1 | Owain | 2 | Ostragoths | 1 | Ommace | 1 | Olchaoin | 1 |
| Orboda | 1 | Orlamunda | 1 | Ostrogothie, d' | 1 | Ostrogotha | 1 | OCTAVIA | 1 |
| Otto | 4 | Orleans, d' | 4 | ORLEANS | 6 | Oseleur, La | 1 | Orcodes, of | 1 |
| Oda | 2 | OSULE | 1 | OGIVE | 1 | Olafsdottir | 1 | Offa | 1 |
| Othon-Guilliame | 1 | Osburh | 2 | oehningen, D' | 2 | Ortiz | 3 | Oesc | 1 |
| Olga | 1 | Ogilvie | 2 | Oltigen | 1 | Osoriez | 1 | Octha | 1 |
| Olaf | 4 | Oxenbridge | 1 | Orviedo | 1 | OBED | 2 | Olivana | 1 |
| Odo | 1 | Ossory | 1 | ORLEANS, OF | 4 | OZIAS | 1 | Ollo | 1 |
| Ogne | 1 | Opaendinge | 1 | Ostrevant, de | 2 | OCTAVIUS | 8 | Olga, St. | 1 |
| Oslac | 4 | Outre-Mer, D' | 2 | OSBURGH | 1 | OSTROGOTHS, de | 11 | Onias I | 1 |
| Ordgar | 1 | Obotrites | 2 | ÖHNINGEN | 1 | ORLEANS, de | 4 | Oeren, d' | 2 |
| Oneca | 3 | Oilly, D' | 1 | ORTENBURG | 1 | ORONTOBADES | 1 | Olympias | 1 |
| Ordono | 7 | old, the | 1 | OENINGEN, VON | 1 | ORA | 2 | - | - |
| Osorez | 2 | Orontes | 6 | OLAFSDATTER | 1 | Osborn | 1 | - | - |
