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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|
| Olofsdotter | 39 | Östergötland, in | 2 | Orgemont, d' | 1 | Ouvrard | 3 | Oke | 1 |
| Ollamhdha | 1 | Obotrites | 2 | Oilly, d' | 3 | Orreby, de | 5 | Ockbrook | 1 |
| O Néill | 1 | Oplandene | 3 | Öhningen | 2 | Olivier | 2 | Ongar | 2 |
| Oslac | 1 | Olavsdatter | 3 | Oilly, de | 2 | Offaly | 3 | Orabel|Orabilis | 1 |
| Osric | 1 | Ogmundsson Smör | 1 | Ouilly, d' | 1 | Obert | 3 | Oxfordshire | 1 |
| OLAFSDOTTIR | 1 | Ormsdatter | 2 | Orscand | 1 | Odart | 1 | Olliergues-en-Auvergne, d' | 1 |
| Orléans | 5 | Ormson | 1 | Oilleia La Ribaude | 1 | Orange, d' | 5 | Owsley | 1 |
| Osborn | 8 | Olavsson | 2 | Ortenau | 2 | Orange | 1 | Oldcotes | 1 |
| Olsen | 1 | Olavsen | 1 | Oenningen, von | 3 | O Mullen | 1 | Oxnead | 1 |
| OINGT, d' | 1 | Ofeigson | 1 | Ogvex | 1 | Otrihouandit | 1 | Oliver|Ollyver | 1 |
| Osgood | 7 | Opplandene | 1 | Oreguen | 1 | Orléans, d' | 1 | Ollyver | 1 |
| Osborne | 3 | Örjansson | 2 | Orengarde | 1 | Oviedo | 1 | Orval, d' | 1 |
| Olds | 8 | Olofson | 1 | Orrubu, di | 1 | Olliergues, d' | 1 | Obarneithic | 1 |
| Oliver | 4 | Orjanssen | 1 | Orr | 2 | Olhain, d' | 1 | Ormdale | 1 |
| Owen | 13 | Orkney | 7 | Ormoy, d' | 1 | Odile | 1 | Ossory | 2 |
| Othelhildis | 2 | Orby | 1 | Orsini | 7 | Ogento, di | 1 | Oldsworth | 3 |
| Ossanne | 1 | Oppland | 1 | Ostmark, der | 1 | Ovequiz | 1 | Oeningen, von | 1 |
| Oudinee | 1 | Olofsson Oldberg | 1 | Orseolo di Venezia | 1 | Osorio | 2 | Orlamünde, von | 6 |
| Oliergues, d' | 5 | Osoriez | 1 | Orable | 1 | Ouvrad | 1 | Ogilvy | 1 |
| Ortenau, der | 2 | Ordonez | 4 | Okehampton | 4 | Oda | 2 | Oldenburg, von | 9 |
| Oberrheingau | 1 | Orozco, de | 2 | Oxford | 5 | Odenkirchen, von | 1 | Ouellet | 7 |
| Oleron, d' | 2 | Oca, de | 2 | Orgeville, D' | 1 | Owrutsch | 1 | Ochten, van | 2 |
| Olander | 1 | Osoriz | 1 | Orlamünde | 1 | Ormonde | 4 | Oberstein, von | 1 |
| Olovsson | 1 | Oneca|Iñiga|Ignacia | 1 | Oudenaarde, van | 3 | Oissery, d' | 1 | Oberstein III, von | 1 |
| Olofsson Kyrö | 1 | Österreich, von | 3 | Oudenaarde V, van | 1 | Outrebois, d' | 2 | Oldenburg | 2 |
| Olofsson Tulkki | 1 | Osona | 1 | Odingsells, de | 3 | Ollehain, d' | 1 | Oppeln | 3 |
| Olofsson Tulkkila | 1 | Oviedo, de | 1 | ofDunmow | 1 | Okeover Fitz Orme | 2 | Ortenburg, von | 2 |
| Örnflucht | 1 | OYEN | 1 | Oswulf | 1 | Orreby | 3 | O Neal | 2 |
| Örnflycht | 1 | Ottarsdatter | 1 | Okeover | 5 | Ossets | 1 | Oates | 1 |
| Olsson | 3 | Obatrides | 1 | Oxon | 2 | Orbais, d' | 3 | Oscar | 1 |
| Olofsson | 49 | Oro', de | 1 | Oise | 4 | Orbais I, d' | 1 | Oger | 1 |
| Olsdotter | 4 | Olvirson | 1 | Oissery-les-Meaux, d' | 1 | Offemont, d' | 2 | Ouinville | 1 |
| Olafsdotter | 1 | Osmun | 1 | Owain ab Ednywain | 1 | Orieldis|Radegonde | 1 | Oueou | 1 |
| Olofsdotter-JAnsdotter | 1 | Otto | 1 | Orlaith | 1 | Orio | 1 | - | - |
| Olsson Fiskare | 1 | Orgemont, D | 1 | Owain | 3 | Oversley | 4 | - | - |
| Östergötland | 1 | Orgemont I, d' | 2 | OSANNE | 2 | Oswestry | 1 | - | - |
