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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|---|---|---|---|---|---|---|---|---|
| Oliver | 31 | Orkney | 7 | Osann | 1 | Overton | 13 | Oxfordshire | 1 |
| Osgood | 1 | Ochtreda | 1 | Odo | 1 | Otes | 11 | Othoere | 1 |
| Ogilvie | 47 | Orr | 7 | Oslac | 1 | Osceria | 1 | Osbert | 1 |
| Oram | 4 | Oliphant | 31 | Obotrites | 11 | Oilly, D' | 4 | Orgwen | 1 |
| Ordway | 1 | Owain | 17 | Oscheret | 1 | Orchard, Le | 4 | Odingsels | 1 |
| Osburga | 1 | Olafsson | 4 | Ogstoun | 1 | Overton, De | 1 | - | - |
| Orchard | 6 | Olafsdottir | 2 | Oirdnidhe | 1 | Oeningen, von | 2 | - | - |
| Osborn | 1 | Olaf, O' | 1 | Orengarde | 1 | Orleans, De | 3 | - | - |
| Ossory | 5 | Olaf | 2 | Orsini | 1 | Odenkirchen, von | 1 | - | - |