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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|---|---|---|---|---|---|---|---|---|
| Octavius | 1 | Ohningen, Von | 5 | Orio | 1 | Orleans | 1 | Oldrich | 1 |
| Olafsdottir | 5 | Orcheret | 1 | Omer, St. | 9 | Ostrogoths | 1 | Oxford | 2 |
| orleans, D' | 4 | Olaffsdatter | 1 | Olaffson | 2 | Õsterreich | 1 | Ogilvy | 4 |
| Olaffsdottir | 1 | Osoriz Count Of Galicia | 1 | Orkney | 4 | Õsterreich, Von | 3 | - | - |
| Orleans, De | 1 | Ordonez | 1 | Odin | 1 | Obatrides | 1 | - | - |
| Olafsson | 6 | oisy, D' | 1 | Oliphant | 4 | Oviedo | 1 | - | - |
| Ottarsson | 1 | oilly, D' | 7 | Oehren | 1 | Orséolo | 2 | - | - |