Surname Interests beginning with - O
| Surname | Place | Period | Submitted by | Email Address |
| OADES | Isle of Axholme | 18-19C | B7502 | MEMBERS ONLY |
| OADES | Luddington | 1750-1850 | B0801 | MEMBERS ONLY |
| OAG | Wick/Caithness, SCT | 17-19C | A3416 | MEMBERS ONLY |
| OAKES | Holbeach/Fleet | 19C | A0902 | MEMBERS ONLY |
| OAKES | Louth | 1800 | A0231 | MEMBERS ONLY |
| OAKLEY | Barking, Essex | | B9641 | MEMBERS ONLY |
| OATES | Sheffield, WRY | 18-19C | B9124 | MEMBERS ONLY |
| OBBINS | Boston | 17-18C | B9623 | MEMBERS ONLY |
| OBREY | Anderby | 1630-1800 | C6310 | MEMBERS ONLY |
| O'BRIEN | Boyle, ROS | 1800-1850 | B0871 | MEMBERS ONLY |
| O'BRIEN | County Kerry, IRL | 1800-1850 | B0871 | MEMBERS ONLY |
| OCKLESHAW | Liverpool, LAN | 17-20C | A1362 | MEMBERS ONLY |
| ODDIE | Grimsby | 17-20C | B7889 | MEMBERS ONLY |
| ODDY | Otley, WRY | 18-21C | B8734 | MEMBERS ONLY |
| ODLIN | Fulstow | c1856 | A0475 | MEMBERS ONLY |
| ODLIN | Louth | 18-20C | A3619 | MEMBERS ONLY |
| ODLING | Fulstow/Ludborough | 17-19C | B9686 | MEMBERS ONLY |
| ODLING | Lincoln area/Barrow | 1800-1900 | B0406 | MEMBERS ONLY |
| ODLING | Tetford | 17-19C | A4206 | MEMBERS ONLY |
| OFFERTON | Gainsborough | 18C | A0006 | MEMBERS ONLY |
| OGDEN | Barrowby | 19-20C | A3916 | MEMBERS ONLY |
| OGDEN | Welby | 17-18C | A3653 | MEMBERS ONLY |
| OGDEN | Wisbech, CAM | 18C | B8707 | MEMBERS ONLY |
| OGILVIE | Falkirk, STI | c1800 | C0694 | MEMBERS ONLY |
| OGLE | Lindsey/Lincoln | 18-19C | B2004 | MEMBERS ONLY |
| OGLESBY | Elsham | 1760 | A0740 | MEMBERS ONLY |
| OGLESBY | Hemswell | 18-19C | A4159 | MEMBERS ONLY |
| OGLESBY | West Keal | 1770-1870 | John Field | jdbafield@btinternet.com |
| OGLESBY | West Keal | c1780-1850 | B0584 | MEMBERS ONLY |
| O'GRADY | Ballinasloe, GAL | c1850 | C0694 | MEMBERS ONLY |
| O'HALLORAN | Eire | 18-19C | B1377 | MEMBERS ONLY |
| O'HALLORAN | Lanark, LKS | 19C | B1377 | MEMBERS ONLY |
| O'HARA | Manchester, LAN | 18-19C | B8456 | MEMBERS ONLY |
| OLDFIELD | Doncaster, WRY | Pre 1800 | B1095 | MEMBERS ONLY |
| OLDFIELD | Little Bytham | 18-20C | B7563 | MEMBERS ONLY |
| OLDFIELD | Sth Lincs/Nth Cambridgeshire | 1880-1920 | B1723 | MEMBERS ONLY |
| OLDHAM | Eagle | 19C | B7138 | MEMBERS ONLY |
| OLDHAM | Lincoln | 19-20C | B0592 | MEMBERS ONLY |
| OLDHAM | Padstow, CON | 1700-1800 | B0851 | MEMBERS ONLY |
| OLDHAM | Scrivelsby | 17-19C | A3776 | MEMBERS ONLY |
| OLDHAM | Sheffield, WRY | 1800-1900 | B0187 | MEMBERS ONLY |
| OLDROYD | Burwell | 17-19C | A4059 | MEMBERS ONLY |
| OLDROYD | Wakefield, WRY | c1850 | C0694 | MEMBERS ONLY |
| OLDROYD | Wisbech, CAM | 19C | B8253 | MEMBERS ONLY |
| OLIFF | Holland area | 1700 + | B2232 | MEMBERS ONLY |
| OLIVER | Bourne, Lincs | 16-19C | B9538 | MEMBERS ONLY |
| OLIVER | Chester, CHS / Manchester, LAN | 19-20C | B1332 | MEMBERS ONLY |
| OLIVER | Deeping St. Nicholas | 19C | A4220 | MEMBERS ONLY |
| OLIVER | Grainthorpe | 1700 + | B0307 | MEMBERS ONLY |
| OLIVER | Grantham | Pre 1850 | C0384 | MEMBERS ONLY |
| OLIVER | Grimsby | 19-20C | A4197 | MEMBERS ONLY |
| OLIVER | Hawkhurst, KEN | 19C | A3596 | MEMBERS ONLY |
| OLIVER | Hull, ERY | 17-18C | A3177 | MEMBERS ONLY |
| OLIVER | Hull, ERY | c1835 | C0384 | MEMBERS ONLY |
| OLIVER | Liverpool, LAN | 19-20C | B1332 | MEMBERS ONLY |
| OLIVER | Manea, CAM | c1815 | B1838 | MEMBERS ONLY |
| OLIVER | March, CAM | 18C | A0062 | MEMBERS ONLY |
| OLIVER | Scarborough | 18-19C | A4197 | MEMBERS ONLY |
| OLIVER | Spalding | 19C | B1332 | MEMBERS ONLY |
| OLIVER | Theddlethorpe | 1700-1900 | B0307 | MEMBERS ONLY |
| OLLE | LIN | 20C | B8412 | MEMBERS ONLY |
| OLLEY | NFK, WAR | 17-19C | A4050 | MEMBERS ONLY |
| OLPHIN | Melton Mowbray, LEI | c1750 | A0062 | MEMBERS ONLY |
| OLSEN | Hull, ERY | 19-20C | B2464 | MEMBERS ONLY |
| OLSON | Grimsby | 1800-1870 | C0223 | MEMBERS ONLY |
| ONN | Holland | 18C | B1597 | MEMBERS ONLY |
| ONN | Louth | 18-19C | B9449 | MEMBERS ONLY |
| ONN | Louth area | 18-19C | B0176 | MEMBERS ONLY |
| ONN | Wigtoft | 18C | C6267 | MEMBERS ONLY |
| ONYON | Doncaster, WRY | 19C | B7551 | MEMBERS ONLY |
| ONYON | Waddington | 18-19C | A3177 | MEMBERS ONLY |
| ORAM | West Hartlepool, DUR | 19C | A1248 | MEMBERS ONLY |
| ORBELL | One Name Study | Any | B0281 | MEMBERS ONLY |
| ORBELL | Pinchbeck/Spalding | 19-20C | B7783 | MEMBERS ONLY |
| ORFORD | Birkenhead, CHS/Liverpool, LAN | 17-20C | A1362 | MEMBERS ONLY |
| ORGILL | Burton on Trent, STS | 18C | B0073 | MEMBERS ONLY |
| ORME | Blackfordby, LEI | 1700-1850 | C0480 | MEMBERS ONLY |
| ORMOND | Swayfield area | Pre 1780 | C0260 | MEMBERS ONLY |
| ORMSBY | Partney | 16C | B9171 | MEMBERS ONLY |
| ORREY | Wainfleet St. Mary | 18-19C | B9597 | MEMBERS ONLY |
| ORRY | Freiston | 18-19C | B7098 | MEMBERS ONLY |
| ORSLEY | | | C6447 | MEMBERS ONLY |
| ORTON | Bilsby | 1700-1800 | B0114 | MEMBERS ONLY |
| ORTON | Darlington, DUR | 19C | B1756 | MEMBERS ONLY |
| ORWOOD | Peterborough, NTH | 19C | B8600 | MEMBERS ONLY |
| ORWOOD | Spalding | 19C | B8600 | MEMBERS ONLY |
| OSBO(U)RNE | Salford & Stretford, LAN | 20C | B1110 | MEMBERS ONLY |
| OSBO(U)RNE | Yarmouth, NFK | 18-19C | B8593 | MEMBERS ONLY |
| OSBORN | Corby Glen | 18-19C | C0260 | MEMBERS ONLY |
| OSBORN | Ryhall, RUT | 18C | B8392 | MEMBERS ONLY |
| OSBORNE | Barking, ESS | 18-20C | A0343 | MEMBERS ONLY |
| OSBORNE | Clee | 17C+ | B9674 | MEMBERS ONLY |
| OSBORNE | Grimsby | 19-20C | A0343 | MEMBERS ONLY |
| OSBORNE | Hastings, Sussex | 19C | C6181 | MEMBERS ONLY |
| OSBORNE | Reading St Giles, BRK | 17-19C | B9200 | MEMBERS ONLY |
| OSBORNE | Swayfield | 1850-1920 | C0260 | MEMBERS ONLY |
| OSBOURNE | Binbrook | 18-19C | B1110 | MEMBERS ONLY |
| OSBOURNE | Cleethorpes | 19C | B8317 | MEMBERS ONLY |
| OSBOURNE | Littleborough & Calderbrook, LAN | 19-20C | B1110 | MEMBERS ONLY |
| OSBOURNE | Old Clee/ Ludford Parva & Magna | 18-19C | B1110 | MEMBERS ONLY |
| OSBOURNE | YKS/ESS | 17-19C | A3522 | MEMBERS ONLY |
| OSEMAN | Bromyard, HEF | 18C | C0072 | MEMBERS ONLY |
| OSGARBIE | Tetney/Irby on Humber | Pre 1650 | C0380 | MEMBERS ONLY |
| OSGARBY | North Kelsey/Searby | 18C | B0657 | MEMBERS ONLY |
| OSGARBY | South Ferriby | 18-19C | B2446 | MEMBERS ONLY |
| OSGERBY | Billinghay | 18-19C | C6220 | MEMBERS ONLY |
| OSTICK | Laneham, NTT | 17-19C | B9247 | MEMBERS ONLY |
| OSTICK | Retford, NTT | All | B9247 | MEMBERS ONLY |
| OSTLER | ERY | 1830-1880 | B0736 | MEMBERS ONLY |
| OSTLIN | Kesteven | 17C | B0803 | MEMBERS ONLY |
| OTTER | Apley/Barlings | 1780-1820 | B1769 | MEMBERS ONLY |
| OTTER | Bucknall | 19C | B1657 | MEMBERS ONLY |
| OTTER | Gainsborough area | 18-19C | B9127 | MEMBERS ONLY |
| OTTER | Grantham area | 18-19C | A3261 | MEMBERS ONLY |
| OTTER | Kirton in Lindsey | 18-19C | B8142 | MEMBERS ONLY |
| OTTER | Nettleham | 1820-1875 | B1769 | MEMBERS ONLY |
| OTTER | One Name Study | | B1061 | MEMBERS ONLY |
| OTTER | South Kesteven | 17-18C | C0260 | MEMBERS ONLY |
| OTTER | Sturton by Stow | 1829 | B1639 | MEMBERS ONLY |
| OTTER | Thorpe Tilney/Timberland | c1860 | B1639 | MEMBERS ONLY |
| OTTER | Treswell, NTT | 19C | B8904 | MEMBERS ONLY |
| OTTERBURN | Harpham, ERY | 1730 + | C0525 | MEMBERS ONLY |
| OUTEN | Warblington, HAM | c1800 | B1219 | MEMBERS ONLY |
| OUTLAW | | | C6436 | MEMBERS ONLY |
| OUZMAN | Gosberton | 19C | B2351 | MEMBERS ONLY |
| OVERALL | CAM | 19C | B0181 | MEMBERS ONLY |
| OVERTON | Bardney | 19c | Trevor Overton | trevor.overton1@googlemail.com |
| OVERTON | Bardney | c1800 | B1007 | MEMBERS ONLY |
| OVERTON | Bardney, Donnington on Bain | 18-19C | B7933 | MEMBERS ONLY |
| OVERTON | Boston | 18-19C | B9266 | MEMBERS ONLY |
| OVERTON | Burgh le Marsh | 18-19C | B9176 | MEMBERS ONLY |
| OVERTON | Burgh le Marsh | 18-19C | A4059 | MEMBERS ONLY |
| OVERTON | Immingham/Keelby | 1800-1900 | A0507 | MEMBERS ONLY |
| OVERTON | LIN | 21C | B1134 | MEMBERS ONLY |
| OVERTON | Louth | 19-20C | A4114 | MEMBERS ONLY |
| OVERTON | Old Leake/Sibsey | 17-19C | A4085 | MEMBERS ONLY |
| OVERTON | Raithby area | 17-18C | B2290 | MEMBERS ONLY |
| OVERTON | Sibsey | 19C | A0852 | MEMBERS ONLY |
| OVERTON | Spilsby area | 18-20C | B9148 | MEMBERS ONLY |
| OVERTON | Stenigot | 18C | A1164 | MEMBERS ONLY |
| OVERTON | Stickford | 18-19C | B8283 | MEMBERS ONLY |
| OVERTON | Timberland | 18-19C | B9359 | MEMBERS ONLY |
| OVERTON | Wainfleet | 18-19C | B9668 | MEMBERS ONLY |
| OVERTON | Wainfleet | 17-19C | B9654 | MEMBERS ONLY |
| OWBRIDGE | Isle of Axholme | 19C | A3567 | MEMBERS ONLY |
| OWEN | Horncastle area | 19C | A3206 | MEMBERS ONLY |
| OWEN | Horncastle area | 19C | A3206 | MEMBERS ONLY |
| OWEN | Lincoln | 18-19C | B9382 | MEMBERS ONLY |
| OWEN | Market Rasen | 19C | B0428 | MEMBERS ONLY |
| OWENS | Liverpool, LAN | 19-20C | A3364 | MEMBERS ONLY |
| OXBY | Aubourn/Coleby | 17-19C | B7638 | MEMBERS ONLY |
| OXBY | Boston area | 17-19C | A3724 | MEMBERS ONLY |
| OXBY | Harmston/Coleby | 17-18C | B7638 | MEMBERS ONLY |
| OYSTERBY | Lindsey | 18C | B0395 | MEMBERS ONLY |