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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|
| Ovalle y Ovalle | 1 | Oliver | 1 | Oisey, De | 1 | Ovruch | 4 | Osoriz | 1 |
| Ovalle y Ureta | 2 | Orselo | 1 | Orozco, de | 4 | Octavius | 4 | Osorez | 1 |
| Ovalle y Mena | 1 | Osorio Pimentel | 1 | Odeline (Emmeline) | 1 | Öttingen | 14 | Osoriez De Lemos | 1 |
| Ortuzar e Ibañez De Ovalle | 2 | Ofeigsson | 2 | Osorio de Cáceres | 1 | Ochsenstein | 1 | Oningen | 1 |
| Odenkirchen | 1 | ORTENBERG | 1 | Oakley, De | 3 | Olney | 2 | Ovalle y Pastene | 1 |
| Ossory | 8 | ORTENGAU | 1 | Ortiz de Salazar | 1 | Ostrogoths | 16 | Ogiers | 1 |
| Ortiz de Urbina | 2 | Olgovich | 1 | Oilleia la Ribaude | 1 | Oxenbridge | 1 | ORTIGEN | 1 |
| Orton, de | 5 | Ouilly, D' | 1 | Oilly, D' | 5 | OLAFSDATTER | 2 | Ovalle Esparza | 1 |
| Oisy | 20 | Orlamunde | 15 | Oilly, De | 2 | Oehringen | 1 | Ovalle Briseño | 1 |
| ODZRA | 1 | Orseolo | 4 | OLDENBURG-DELMENHORST | 2 | Ochoa Igartuzabal | 1 | Orestilla | 1 |
| Ostmark | 4 | Oge-Mor | 1 | Ovequiz | 2 | ORSINI | 7 | Oyuelos Fernandez De Velasco | 1 |
| Ortiz | 7 | Oldenburg | 45 | Oteiza | 1 | Olba\Alda | 1 | Oyuelos | 1 |
| Ostrevant & Amiens & Vexin | 1 | OTTOSDATTER | 1 | OLALIZ | 1 | Osnabruck | 1 | Orueta Resusta | 1 |
| Oberrheingau | 1 | Oslo | 11 | Olafsdottir | 2 | Oswestry | 3 | Orueta | 1 |
| Owain | 21 | Olaso | 1 | OENINGEN | 1 | Olmos de Aguilera | 1 | Ober Isar | 1 |
| Orkney | 19 | Osoriez | 2 | OGMUNDSSON | 1 | Ovalle Valdes | 1 | Olivera y Toledo | 1 |
| Osborne | 4 | Oehningen | 3 | Oldenburg-Wildeshausen | 2 | Onias | 1 | Ortenburg | 1 |
| OLAFSSON | 15 | Oghaman | 1 | Oldenburg-Wildehausen | 3 | Ora | 1 | Olivera Salas | 1 |
| Ortiz de Velasco | 2 | Osorio | 5 | Ochten | 2 | Odeon | 1 | Ortiz de Tena | 1 |
| Ortiz de Zárate Fernandez de Zárate | 1 | Omer, St. | 10 | Ohningen | 7 | Õsterreich | 4 | ODRYSIAN | 1 |
| Ortiz de Zárate | 1 | Olivos Valenzuela | 1 | Oberstein | 2 | Ovalle y Zapata | 3 | Orleanscount | 1 |
| Ortenau | 2 | Osnad | 1 | Osorez Suarez De Selgas | 1 | OBERLAHNGAU | 1 | Ordgar | 1 |
| Ortiz de Arbescos y Undona | 1 | Osraige | 1 | Orfitus | 4 | Ovalle Errazuriz | 2 | Ovalle Gallardo | 1 |
| Olaf, O' | 1 | Obda | 1 | Oviedo | 3 | Ortuzar Formas | 2 | Oilamdhda | 1 |
| Olmos de Aguilera Zurita | 1 | Olivos | 2 | Orreby | 1 | Ovalle Ureta | 1 | Ollchaoin | 1 |
| Ortiz de Gaete | 3 | Ortiz de Elguea y Chacón Quiroga | 1 | Ortiz de Elguea | 6 | Ochoa de Aseibar | 1 | Ozem | 1 |
| Orleans | 36 | Orcades | 2 | Oyley, D' | 2 | Obadiah | 1 | Onan | 1 |
| ORLAMUNDA, Von | 1 | Ollamhdha | 2 | OISELET | 1 | Ovalle y Amasa | 1 | Odinsson | 2 |
| ORLAMUNDA | 1 | Ollamh | 1 | Orrubu, Di | 1 | Ovalle Amasa | 2 | Offlay | 1 |
| Ortuzar Basave | 1 | Obotrites | 6 | Ogilvy | 5 | Ovalle Vivar | 1 | Oswulfsson | 1 |
| Ortuzar | 1 | ORLEANS, D' | 2 | Ogilvie | 1 | Ossery | 1 | Orgaycena | 1 |
| Ortega | 1 | Ostrevant | 4 | Ossetian | 1 | Oehren | 1 | Ortuzar Basave y Morales de la Camara | 1 |
| Ovalle | 4 | Ortiz de Gaete y Carabantes | 1 | Oels | 1 | Ovalle y Ordoñez | 1 | Odiaga | 1 |
| Ordoñez | 6 | Orange | 9 | Oliergues, d' | 1 | OECHLINGEN | 1 | - | - |
