| famname | Location | URL | Name |
| Nelz | Pfalz,Saarland / Baden-Wuerttemberg / Germany | www.algonet.se/~vhartman/index1.htm | Jürgen Hartmann |
| Newmarch | England | | Stan Newmarch |
| Nicely | USA | | Doris T. Goldsborough |
| Nixon | PA USA | www.geocities.com/Heartland/Ranch/1322 | Gracie Stover |
| North | PA,OH,IL,USA | | Annette Ward |
| Näbrig | DE>US | members.localnet.com/~lbeilein | Linda Nebrich Beilein |
| O'Donnell | USA, Ireland | ynot.netgrp.net/~tursky/index.html | Richard J. O'Donnell |
| O'Dyer | ENG to VA, USA | www.geocities.com/Heartland/Acres/7241/index.html | Belinda Melton Hughes |
| O'Neill | England, Ireland, Switzerland, USA | web.interx.com/pearson | Lloyd Pearson |
| Odenbaugh | US from Germany | www.IrishGenealogy.com/Odenbaugh.htm | Georgeann Malowney |
| Oldfield | USA | home.sprynet.com/sprynet/oldfield | Jim Oldfield |
| Olson | Sweden to PA and NY | hometown.aol.com/hm8485/myhomepage/heritage.html | Laura Simonson |
| Ore | TX>OK | www.familytreemaker.com/users/g/a/r/Leona--Garcia-WA/ | Leona Kollman Garcia |
| Ore | Ireland, Scotland,USA>OH>TX>OK | www.familytreemaker.com/users/g/a/r/Leona--Garcia-WA/ | Leona Kollman Garcia |
| Orr | USA,PA,ADAMS COUNTY | www.epix.net/~wkennedy | Bill Kennedy |