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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|
| Osborn | 4 | Olaf 'Mikg' Bjornsson King of Sweden | 1 | Oleg | 2 | Otterbach or Utterback | 1 | Ottarsson of Sweden | 1 |
| Ottarsson | 1 | Orkney | 2 | Olga Grand Duchess of Kiev | 1 | Ouyngton | 1 | Ostrogotha Chief of Ostrogoths | 1 |
| Olafsdottir | 1 | Ogive | 1 | Oldrich | 2 | Orell | 3 | Owen | 1 |
| Ohningen | 2 | Oslac the Royal Cup Bearer of Wessex | 1 | Oldrich, Duke of Bohemia | 1 | Olaf "Tree-Hewer" Ingjaldsson King of Sweden | 1 | Odo | 1 |
| Olafsson | 3 | Okeston | 2 | Ota, Duke of Moravia | 1 | Oxton | 1 | Odo II Count of Blois | 1 |
| Oberto I Marchese of Este | 1 | Olafsdotter | 1 | Otto, Duke of Swabia | 1 | Othelendis | 1 | Oeren, von | 1 |
| Otto II Count of Rzymska | 1 | Olaf | 1 | Otto | 2 | Orleans Count, De | 1 | Olafsdottir Queen of Denmark | 1 |
| Osenevich | 1 | Ossory | 1 | Ottringham, De | 2 | Oeren | 1 | oWENWYNWYN | 1 |
| Orleans | 7 | Owain Gwynedd | 3 | Ozbun | 10 | Orla Of Saxony | 1 | Owen gwynedd | 1 |
| Ostrogoths | 14 | Ostrogoths, d' | 1 | Olaffson King of Haithabu | 1 | Olafsdatter | 1 | Odo Count in the Wetterau | 1 |
| Ormeston | 1 | Otton Prince of Poland | 1 | Osburgh of Wight Queen of Wessex | 1 | Oyly, D' | 1 | Onias | 1 |
| Oreguen | 1 | Oda | 3 | Odacre | 3 | Orlaith | 1 | Omer Earl of Chester, St. | 1 |
| Odo I Count of Maurienne | 1 | Obotrites | 1 | Orleans, d' | 1 | Oeren, De | 1 | - | - |
| Owain | 15 | Olafsson, King of Sweden | 2 | Osborne | 1 | Ode | 1 | - | - |
| Otto I "The Great" Holy Roman Emperor | 1 | Olafsdatter, Queen of Norway | 1 | Orton | 1 | Orderdonk | 1 | - | - |
| Owain Gwynedd Prince of North Wales | 1 | Olava | 1 | Oeningen, Von | 2 | Orleans Countess, De | 1 | - | - |
