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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|---|---|---|---|---|---|---|---|---|
| Ogilvy | 7 | Oplaendinge | 1 | Olafsdotter | 1 | Omer, St. | 1 | O Toole | 4 |
| Ogilvey | 1 | Oda | 1 | Obotrites | 3 | Owain | 2 | O Byrne | 2 |
| Osgood | 3 | Ostrogoths | 1 | Orth | 3 | O Olaf | 1 | O Braenain | 2 |
| Ogilvie | 1 | ostrogothie, D' | 1 | Orval, De | 3 | Oldcastle | 1 | O Caellaide | 1 |
| Orleans | 3 | orleans, D' | 1 | Orval | 1 | Owen | 2 | O Gairbita | 1 |
| Orleans, Of | 1 | Ogle | 9 | Olafsdatter | 2 | Odding | 4 | Ordonez | 1 |
| Olafson | 1 | Olavsson | 1 | Orcharton, De | 2 | O Donovan | 1 | - | - |
| Orleans (De Anjou), De | 1 | Ogle, De | 1 | Orcherton | 1 | Ogston | 1 | - | - |