surnames ... O
| SURNAME | DATES | LOCATION | MEMBER |
|---|---|---|---|
| OAKLEY | All | YKS | B91/92 |
| OAKLEY | All | LAN | B91/92 |
| OLIVERSON | 1800-1900 | Ormskirk LAN | C70 |
| OLLERTON | Pre 1900 | Ormskirk LAN | S20 |
| OLVERSON | All | Halsall LAN | O13 |
| OLVERSON | All | Scarisbrick LAN | O13 |
| ORMANDY | 1800-1900 | Scarisbrick LAN | R30/31 |
| ORMANDY | All | Scarisbrick LAN | W62 |
| ORMANDY | All | Ormskirk LAN | B77 |
| ORMANDY | All | Scarisbrick LAN | B77 |
| ORMANDY | All | Ormskirk LAN | W62 |
| ORMANDY | 1800-1900 | Ormskirk LAN | R30/31 |
| ORME | 19C | Ormskirk LAN | W54 |
| ORMESHER | 1800s | Ormskirk LAN | R56 |
| ORMESHER | Pre 1842 | Lathom LAN | W06 |
| ORMESHER | All | Ormskirk LAN | W06 |
| ORMESHER | 1800 | Anglezark LAN | C61 |
| ORMESHER | 1800s | Lathom LAN | R56 |
| ORMESHIRE | All | Ormskirk LAN | W06 |
| ORMSHAW | All | Aughton LAN | S93 |
| ORMSHAW | All | Ormskirk LAN | S93 |
| ORRITT | All | Ormskirk LAN | W06 |
| OWEN | All | Ormskirk LAN | K19 |
| OWEN | All | Burscough LAN | K19 |
| OX(T)ON | 1700s | Wirral CHS | C66 |