
| Surname | Place | Period | Submitted by | Email Address |
| ILES | LIN | All | B7493 | MEMBERS ONLY |
| ILLSON | Morton by Bourne | 18C | A0365 | MEMBERS ONLY |
| IMPEY | HRT | 17-20C | A3559 | MEMBERS ONLY |
| INCH | Barrow on Humber | 1820-1850 | B0736 | MEMBERS ONLY |
| INCH | Caistor | c1854 | C0351 | MEMBERS ONLY |
| INDEL | Kirton in Holland | 18-19C | B9336 | MEMBERS ONLY |
| INGAL | Wellingore | 17-18C | B8649 | MEMBERS ONLY |
| INGALL | Corby Glen | 1780 | A0417 | MEMBERS ONLY |
| INGALL | Little Hale | 19-20C | B7065 | MEMBERS ONLY |
| INGALL | Potterhanworth | 18-19C | B9411 | MEMBERS ONLY |
| INGALL | Wellingore | 18C | C6395 | MEMBERS ONLY |
| INGALL (JAMES) | Sleaford/Lincoln | 20C | B1418 | MEMBERS ONLY |
| INGALL (SAMUEL) | Grantham/Sleaford | 20C | B1418 | MEMBERS ONLY |
| INGALL/INGLE | Corringham | 1787 | C6419 | MEMBERS ONLY |
| INGAMELLS | Croft/Swineshead | 19-20C | A3535 | MEMBERS ONLY |
| INGAMELLS | Stickney | 18-19C | B7141 | MEMBERS ONLY |
| INGHAM | Owston Ferry | 19C | B7760 | MEMBERS ONLY |
| INGHAM | Rasens | 18-20C | B9318 | MEMBERS ONLY |
| INGHAM | Skellingthorpe/Wickenby | 17-18C | B8629 | MEMBERS ONLY |
| INGILBY | LIN | 17-20C | B1982 | MEMBERS ONLY |
| INGLE | Colsterworth | 18-19C | B8998 | MEMBERS ONLY |
| INGLE | Great Hale | 1700-1851 | A0201 | MEMBERS ONLY |
| INGLEBY | LIN | 18-20C | B1982 | MEMBERS ONLY |
| INGLEBY | Ludborough | Pre 1850 | B1982 | MEMBERS ONLY |
| INGLEBY | North Thoresby | 18-19C | B9650 | MEMBERS ONLY |
| INGLEBY/INGELBY | LIN | 17-20C | B1982 | MEMBERS ONLY |
| INGLEDEW | Doncaster, WRY | 18-19C | A4049 | MEMBERS ONLY |
| INGOLDBY | LIN | bef 19C | A4091 | MEMBERS ONLY |
| INGOLDSB Y | Wyberton | 18C | A0852 | MEMBERS ONLY |
| INGRAM | Boston | 18-20C | B8036 | MEMBERS ONLY |
| INGRAM | Caistor | 17-19C | B9488 | MEMBERS ONLY |
| INGRAM | Wrawby | c1800 | A0740 | MEMBERS ONLY |
| INKLEY | Bourne | 18-19C | B9750 | MEMBERS ONLY |
| INKLEY | Bourne area | 18C | B0769 | MEMBERS ONLY |
| INMAN | Melton Mowbray, Lincoln | 18-20C | A3749 | MEMBERS ONLY |
| INNES | Spalding | 19C | B9416 | MEMBERS ONLY |
| INNOCENT | East Stoke, NTT | 18C | A0006 | MEMBERS ONLY |
| INSULL | Bilston, STS | 18C | B7213 | MEMBERS ONLY |
| IRBY | All | 17C | C0394 | MEMBERS ONLY |
| IRELAND | Coningsby | 17C | B9471 | MEMBERS ONLY |
| IRELAND | Frampton/Sibsey | 17-19C | B9471 | MEMBERS ONLY |
| IRELAND | Frith Bank | 1600-1800 | B0506 | MEMBERS ONLY |
| IRELAND | Frithville | 19-20C | B9577 | MEMBERS ONLY |
| IRELAND | Sibsey | 18-19C | B8850 | MEMBERS ONLY |
| IRELAND | Stamford | 18-19C | B9579 | MEMBERS ONLY |
| IRESON | Yarwell, NTH | 18-19C | A4061 | MEMBERS ONLY |
| IRLAND | Woodthorpe, Notts | 16-20C | A4224 | MEMBERS ONLY |
| IRONMONGER | Grimsby | 19-20C | A4086 | MEMBERS ONLY |
| IRONMONGER | Louth | 19-20C | B8556 | MEMBERS ONLY |
| IRONMONGER | Revesby | 19-20C | A3801 | MEMBERS ONLY |
| ISA(A)C(KE) | Foston/Long Bennington/Gonerby/Grimsby/Fulbeck | 16-17C | C6325 | MEMBERS ONLY |
| ISAAC | Fulbeck/Sleaford areas | 17-21C | C6032 | MEMBERS ONLY |
| ISAAC | Grimsby | 19C | A4141 | MEMBERS ONLY |
| ISAAC | Heydour | 1700-1850 | B0655 | MEMBERS ONLY |
| ISAAC | Heydour area | 18C | C0260 | MEMBERS ONLY |
| ISAAC | Horton, GLS | c1780 | C0694 | MEMBERS ONLY |
| ISAAC | Long Bennington | 18C | C6170 | MEMBERS ONLY |
| ISAAK | Caythorpe/Fulbeck | 17-18C | A3445 | MEMBERS ONLY |
| ISATT | Gosberton/Surfleet | 17-19C | B9467 | MEMBERS ONLY |
| ISHAM | Boston | 19C | B9439 | MEMBERS ONLY |
| ISHERWOOD | Outwood & Kersley, LAN | c1860 | C0272 | MEMBERS ONLY |
| ISLE(S) | LIN | All | B7493 | MEMBERS ONLY |
| ISLIP | Melchbourne, BDF | 17-19C | A3666 | MEMBERS ONLY |
| ISON | Ashby de la Zouch, LEI | c1800 | B1360 | MEMBERS ONLY |
| ISSOTT | Lincoln | 18C | B8874 | MEMBERS ONLY |
| IVES | Bourne/Spalding | 17-18C | B0887 | MEMBERS ONLY |
| IVES | Brightlingsea, ESS | 18-19C | A3013 | MEMBERS ONLY |
| IVES | Newark, NTT | All | B7792 | MEMBERS ONLY |
| IVES | Southwark, SRY | 19C | A3047 | MEMBERS ONLY |