| famname | Location | URL | Name |
| Lassiter | USA | www.angelfire.com/ny/LesleysWorld/index.html | Lesley Prey |
| Lathim | U. S. | www.geocitiesFHeartland/Farm/6582/ | Elizabeth Schooler Watkins |
| Lauber | Pennsylvania, USA | sbm.temple.edu/~clauber | Jack Lauber |
| Lavoie | Canada | www.geocities.com/Heartland/Prairie/2089/ | Andy Barnett |
| Layton | USA/KY>KA>TX | www.geocities.com/Athens/Parthenon/1433/ | Rosa Whitehorn Smith |
| Layton | England, Ireland, Switzerland, USA | web.interx.com/pearson | Lloyd Pearson |
| Lazzaro | Calabria,IT>USA>IN | www.familytreemaker.com/users/g/a/r/Leona--Garcia-WA/ | Leona Kollman Garcia |
| Lebo | PA | members.aol.com/rogercubs/index.html | Roger Cramer |
| Leech | USA-SC>AL>MS>AR>TX | www.angelfire.com/al/gumbosplace/ | Gary Dyer |
| Lehfeldt | Germany | www.angelfire.com/co/readersandguillaumes/ | Sandy Reader |
| Lehhart | Sprendlingen,Hessen,DE>Frank,Saratov,RU | www.familytreemaker.com/users/g/a/r/Leona--Garcia-WA/ | Leona Kollman Garcia |
| Lehre | Germany, Nagold | | Robert A. Schmelzlen |
| Leibenguth | ch-de-fr-us | Floupiac.inria.fr/Feisenbeis | Henri Eisenbeis |
| Lenhardt | Sprendlingen,Hessen,DE>Frank,Saratov,RU | www.familytreemaker.com/users/g/a/r/Leona--Garcia-WA/ | Leona Kollman Garcia |
| Leonhardt | Sprendlingen,Hessen,DE>Frank,Saratov,RU | www.familytreemaker.com/users/g/a/r/Leona--Garcia-WA/ | Leona Kollman Garcia |