 | | Oakley | |
 | | O'Connell | |
 | | O'Donnell | |
 | | O'Driscoll | |
 | | Oesterley | |
 | | O'Flaherty | |
 | | Ogilvie | |
 | | O'Halloran | |
 | | O'Keefe | |
 | | Old | |
 | | Oldacre | |
 | | Oliphant | |
 | | Oliver | |
 | | O'Neil(l) | |
 | | Oppington | |
 | | Orchard | |
 | | O'Reilly | |
 | | Ormrod | |
 | | Osborn(e) Osbourne | |
 | |
Ostler | |
 | | O'Sullivan | |
 | | Outwin | |
 | | Over | |
 | | Overton | |
 | | Owen(s) | |
 | | Oyler | |
 | | | |
 | | | |
 | | | |
 | | | |
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