214 results
| Oliver | 903 |
| Olivier | 749 |
| Osborne | 616 |
| Owen | 582 |
| Olsen | 530 |
| Orr | 310 |
| Old | 282 |
| Otto | 273 |
| Owens | 206 |
| Opperman | 189 |
| Omar | 178 |
| Ormsby | 145 |
| Orange | 139 |
| Osman | 137 |
| Ogle | 135 |
| Oakley | 110 |
| Oliphant | 104 |
| Olive | 99 |
| Osborn | 90 |
| Oldham | 87 |
| Oxford | 87 |
| Oates | 79 |
| Olson | 75 |
| Overland | 73 |
| Oliveira | 71 |
| Ormond | 69 |
| Oaks | 64 |
| Overton | 62 |
| Ogden | 59 |
| Ong | 57 |
| Oswald | 42 |
| Orton | 42 |
| Oram | 41 |
| Oak | 39 |
| Orchard | 38 |
| Oscar | 37 |
| Over | 35 |
| Oxley | 35 |
| Ohlson | 34 |
| Oneill | 31 |
| Obrien | 28 |
| Oconnor | 25 |
| Orlando | 24 |
| Osmond | 20 |
| Oyster | 19 |
| Otten | 17 |
| Overall | 16 |
| Oakes | 16 |
| Omara | 16 |
| Obermeyer | 15 |
| Osler | 15 |
| Openshaw | 15 |
| Otis | 15 |
| Ore | 15 |
| Ormiston | 14 |
| Orsborn | 14 |
| Oregon | 14 |
| Ott | 13 |
| Oldfield | 13 |
| Otter | 12 |
| Ottley | 12 |
| Oconnell | 12 |
| Orrell | 11 |
| Oleary | 11 |
| Organ | 11 |
| Opel | 10 |
| Ortega | 10 |
| Osbourne | 10 |
| Officer | 9 |
| Oppelt | 9 |
| Omer | 8 |
| Osten | 8 |
| Olney | 8 |
| Oppenheimer | 8 |
| Olesen | 8 |