| The Cambridge Explorer | |
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| Surname Prevalence Chart | |
| A: Sorted by Surname | O |
| Occupant Surname | Occurances |
| Oakford | 1 |
| Oakham | 1 |
| Oakley | 2 |
| Oakman | 5 |
| Oakshott | 2 |
| Oates | 2 |
| Oatman | 1 |
| O'Brien | 1 |
| O'Connor | 1 |
| Odams | 4 |
| Odel | 1 |
| Odell | 15 |
| O'Dwyer | 1 |
| Offer | 1 |
| Offley | 2 |
| Offord | 4 |
| Ogilvie | 1 |
| Ogle | 1 |
| Ogle & Watts | 1 |
| Ogram | 3 |
| O'Hannan | 1 |
| O'Hare | 4 |
| Oldham | 1 |
| Olett | 1 |
| Oliver | 6 |
| Onyett | 2 |
| Orders | 4 |
| O'Reilly | 1 |
| Ormiston | 1 |
| Orpen | 1 |
| Orrey | 1 |
| Orris | 1 |
| Orriss | 1 |
| Orrs | 1 |
| Orton | 3 |
| Orwood | 1 |
| Osborn | 6 |
| Osborne | 13 |
| Osbourn | 1 |
| Osbourne | 4 |
| Oslar | 1 |
| Osler | 1 |
| Osman | 1 |
| Othmer | 1 |
| Over | 2 |
| Overhill | 2 |
| Overton | 2 |
| Owen | 5 |
| Owers | 1 |
| Oxberry | 1 |
| Oyston | 2 |
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