| Lacy (L200) | Owermoigne, Dorset | 1650 | 1700 | ElizabethHerts |
| Laister (L236) | Epworth | | | Jill |
| Lake (L200) | Middlesex | 1850 | 2000 | Reading1871 |
| Lake (L200) | Winterbourne St Martin, Dorset | 1650 | 1750 | Merry |
| Lakin (L250) | Alrewas, Staffordshire | 1780 | 1830 | Merry |
| Lally Or Lalley (L464) | Galway: St Helena: Birr, Co. Offaly: London: Lewes,Sussex | | | Ann from Sussex |
| Lamb (L510) | cambridge | 1500 | | teddybr |
| Lamb (L510) | greenwich | 1781 | 1844 | lyndenh55 |
| Lamb (L510) | Huntingdon | 1500 | | HuntsLamb |
| Lamb (L510) | Huntingdon, Huntingdonshire | 1500 | 1820 | ElizabethHerts |
| Lamb (L510) | North Newington, Oxfordshire | 1680 | 1800 | Merry |
| Lamb (L510) | South Newington, Oxfordshire, UK | 1700 | 1750 | Christine in Herts |
| Lamb (L510) | Whitby, Yorkshire | 1818 | 1920 | ElizabethHerts |
| Lambourn (L516) | Buckinghamshire - Twyford | 1800 | | Langley Vale Sue |
| Lamont (L553) | scotland | 1700 | 1800 | Lloyd |
| Lancaster (L522) | Dunstable, Beds, UK | 1700 | 1900 | Christine in Herts |
| Lancaster (L522) | Maidenhead, Berks, UK | 1800 | 1950 | Christine in Herts |
| Lancaster (L522) | Swindon, Wilts, UK | 1900 | 1980 | Christine in Herts |
| Landburn (L531) | Canada - Ontario | 1800 | 1900 | Langley Vale Sue |
| Lander (L536) | Poole, Dorset | 1770 | 1800 | Merry |
| Lane (L500) | Whitby, Yorkshire | 1750 | 1830 | ElizabethHerts |
| Langford (L521) | Standon, Hertfordshire | 1760 | 1800 | Merry |
| Langley (L524) | Cuckfield, Sussex | 1750 | 1800 | Jill |
| Langley (L524) | Sutton, Sussex | 1630 | 1785 | Jill |
| Langley (L524) | Wokingham, Berkshire | 1600 | 1900 | marquette |
| Langridge (L526) | Ramsgate, Kent | 1640 | 1947 | maryphil |
| Langtree (L523) | Fawley, Hampshire | 1700 | 1740 | Merry |
| Lanning (L552) | St Marylebone, London | 1800 | 1900 | Phoenix |
| Lanning (L552) | St Pancras, St Marylebone, London | 1770 | 1900 | Kangaroo |
| Lapraik (L162) | Wandsworth, Surrey | 1890 | 1920 | Jill |
| Larcombe (L625) | Dorset | | | Carolyn P |
| Larke (L620) | London, England, UK | 1600 | 1710 | Christine in Herts |
| Latchford (L321) | Herts Beds | 1700 | 1830 | Oakum Picker |
| Laughlan(D) (L245) | Drumachose Co. Derry, Paisley, Partick, Renfrewshire | 1800 | | |
| Laurie (L600) | Dunscore, Dumfries, Scotland | 1600 | 1800 | marquette |
| Lavake (L120) | | | | bethanyleigh |
| Lavender (L153) | Ridge, Hertfordshire | 1800 | 1880 | Merry |
| Law (L000) | Beds | 1700 | 1750 | Oakum Picker |
| Lawrence (L652) | Eye, Suffolk | | | linds1967 |
| Lawrence (L652) | Mile End, Stepney, London | 1827 | 1880 | Jill |
| Lawry (Lory) (L646) | Keverne,St - Cornwall | 1680 | 1710 | |
| Laws (L200) | | | | Gordon |
| Lawson (L250) | | | | Daphne |
| Laycock (L220) | Blackburn, Lancashire; Sutton-in-Craven, West Riding of Yorkshire | 1700 | 1890 | Janet |
| Laycock (L220) | London, Australia | 1750 | 1850 | HarrysMum |
| Leask (L200) | | | | James Binning |
| Ledger (L326) | Cobham, Surrey | 1700 | 1870 | Nell |
| Ledger (L326) | London | 1830 | 1980 | Nell |
| Lee (L000) | Brighthelmston, Sussex | 1700 | 1850 | marquette |
| Lee (L000) | London | 1800 | 2026 | Reading1871 |
| Lee (L000) | Roden, Shropshire, England | 1352 | 1664 | Moonlightflower |
| Leese (L200) | Lancashire - Oldham | 1723 | | |
| Leggatt (L230) | Sutton, Sussex | 1680 | 1850 | Jill |
| Lemmon (L550) | Norfolk | 1756 | 1947 | maryphil |
| Lemon (L550) | Suffolk | 1600 | 1800 | Oakum Picker |
| Lenhof (L510) | | | | bethanyleigh |
| Lennox (L520) | Anniesland, Glasgow & Renfrewshire, Scotland | | | Vivian |
| Lesage (L220) | | | | bethanyleigh |
| Lester (L236) | | 1852 | | Gklester |
| Lett (L300) | Co Wexford | 1699 | 1810 | JaneNewTown |
| Lett (L300) | Cos. Wexford and Carlow, Ireland | 1700 | 1900 | |
| Lett (L300) | Dundee & Sydney, NSW, Australia | 1883 | 1933 | |
| Leveque (L120) | | | | bethanyleigh |
| Lewer (L600) | Sussex | | | Ann from Sussex |
| Lewis (L200) | Saltford, Keynsham, Somerset | 1750 | 1850 | Merry |
| Lewis (L200) | Ystradgynlais, Glamorgan | 1770 | 1870 | Michael |
| Lewthwaite (L330) | Cockermouth, Cumberland | 1830 | 1910 | Merry |
| Lewthwaite (L330) | Duxford, Cambridgeshire | 1850 | 1860 | Merry |
| Light (L230) | West Wittering, Sussex, UK | 1600 | 1900 | Christine in Herts |
| Lightwood (L233) | Northampton | | | nikkib |
| Lilly (L400) | | | | bethanyleigh |
| Liming (L552) | Wombourne, Staffordshire | 1780 | 1880 | Merry |
| Lindley (L534) | Doncaster | 1865 | 1940 | Jill |
| Lindner (L535) | Silesia Prussia, and South Australia | 1807 | | Pinefamily |
| Lindsey (L532) | Dent, Yorkshire W/R | 1765 | 1850 | RavKen |
| Ling (L520) | Kettleburgh, Suffolk; West Ham, Essex | 1830 | | James18 |
| Ling (L520) | Suffolk | | | Carolyn P |
| Linn (L500) | Brighthelmstone, Sussex | 1500 | 1800 | marquette |
| Lishman (L255) | Cumbria | 1750 | 1900 | Uncle John |
| Lishman (L255) | Northumberland | 1820 | 2000 | Uncle John |
| Littler (L346) | Nantwich, Manchester | 1800 | 1862 | Sunny Kate |
| Lloyd (L430) | Herefordshire - Avenbury | 1840 | 1940 | Langley Vale Sue |
| Lloyd (L430) | Shropshire - Cleobury Mortimer | 1800 | 1900 | Langley Vale Sue |
| Lochead (L230) | Paisley, Glasgow | 1750 | 1900 | DavidByrne |
| Lofthouse (L132) | Wakefield, Huddersfield, Yorkshire, UK | 1779 | | JALimestonePlains |
| Longhurst (L526) | Portsmouth area, Hants, UK | 1700 | 1750 | Christine in Herts |
| Looker (L260) | Southampton, Hampshire | 1880 | 1950 | Merry |
| Lorde (L630) | Lancashire - Rochedale | 1574 | 1596 | |
| Love (L100) | Kingswinford Stafford Middlesbrough | 1800 | 2000 | |
| Lovell (L140) | Greenwich | 1800 | 1950 | SBDFHS |
| Lovell (L140) | Rudston/Seamer | 1780 | 1850 | Janet in Yorkshire |
| Lowry (L600) | Cumberland, England | 1700 | 1850 | David Lowry |
| Lowson (L250) | Kirriemuir, Forfar, | 1750 | 1920 | JBee |
| Lucas (L220) | Staffordshire | 1700 | 1800 | Gert in Oz |
| Lumsdane, Lumsden, Lumesden (L523) | Edinburgh | 1780 | | JBee |
| Lund (L530) | West Yorkshire | 1600 | 1920 | Canucky Woman |
| Lundquist/Lindquist (L532) | Vasternorrland Sweden and South Australia | | | Pinefamily |
| Lyckfold / Lyckefold (L214) | Hampshire | | | Christine in Herts |