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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|---|---|---|---|---|---|---|---|---|
| Odin | 1 | Oviedo | 3 | Otto | 3 | Odoacre | 1 | Ogle | 2 |
| Ochs | 2 | Orleans | 4 | Omlar | 1 | Overton | 9 | Overion | 1 |
| Oliver | 11 | Osberga | 2 | Ordgar | 2 | Olivares | 1 | Omsbee | 1 |
| Osborne | 19 | Offaley | 2 | Ogden | 3 | Oney | 1 | Ollagnier | 1 |
| Osborn | 14 | Olomouc | 2 | Owens | 5 | Orton, De | 1 | Offerman | 1 |
| Oldham | 10 | Obotrites | 2 | Ownings | 1 | OCraig | 1 | Otis | 2 |
| Olney | 2 | Oennigen | 3 | Oakes | 1 | Ontree | 1 | Osbourne | 1 |
| Odell | 4 | Oborites | 2 | Onley | 1 | Orio | 1 | Olmsted | 1 |
| Ortenberg | 5 | Oeningen | 2 | Owen | 2 | Oberndorfer | 5 | Offley | 1 |
| Oise | 2 | Ostrogoths | 2 | ofVermandois | 1 | Oltmann | 2 | Odingsells | 1 |
| Orkney | 1 | Ogilvy | 4 | Ogive | 2 | Ogilvie | 2 | Odinsels | 1 |
| Ossory | 19 | Orange-Nassau | 1 | Ollchaaian | 1 | Opie | 1 | Og | 1 |
| Orlamunda | 2 | Orleans, d' | 13 | Obed | 1 | Oates | 6 | Oliphant | 1 |
| Ormonde | 1 | Orleans-Braganza | 1 | Ober, St. | 2 | Olga | 1 | - | - |
| Oisy, d' | 1 | Orleans-Longueville, d' | 1 | Old | 6 | Oyly, D' | 2 | - | - |
| Ordonez | 1 | others | 1 | Odo | 3 | Olley | 2 | - | - |