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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|---|---|---|---|---|---|---|---|---|
| Oversby | 3 | Olsdtr Meland | 1 | Oppegrden | 3 | Oian | 1 | Orton | 1 |
| Orendorff | 1 | Omett | 3 | Ofeigsson | 2 | Ortquist | 1 | Obray | 1 |
| Odell | 1 | Oelke | 1 | Ogmundsson | 1 | Otterson | 6 | Ockey | 1 |
| Olenick-Wickenden | 1 | Oygarde | 1 | Oliver | 1 | Owens | 1 | Ott | 2 |
| Oleksyj | 1 | Odamil | 1 | Ona | 1 | Ozirney | 1 | Oberholtzer | 1 |
| Olsen | 14 | Oddmundson | 1 | Olsdtr Styve | 1 | Olesdtr | 1 | Overbagh | 1 |
| Olson | 40 | Odden | 2 | Olive | 1 | Olstad | 1 | Olavsson | 1 |
| Orr | 2 | Ovevoll | 1 | Ottun | 31 | Orser | 1 | Oppegard | 1 |
| Olsdtr | 13 | O 'Toole | 2 | Ottum | 23 | Oleson | 1 | Ormsdtr | 1 |
| OMSTED | 1 | Orlaith | 1 | Odland | 5 | Ondredal | 1 | Ottarson | 1 |
| Orth | 1 | Ogletree | 2 | Ottem | 23 | Olsson | 1 | Ofstedal | 1 |
| Ovstdal | 6 | Osmond | 5 | Odegarden | 1 | Onofriechuk | 1 | Olafsson | 1 |
| Ovstedal | 44 | Olason | 2 | Olsgaard | 13 | Orval | 1 | - | - |
| Ovre Rasdal | 1 | Olasdtr | 6 | Owen | 1 | Olinyk | 1 | - | - |
| Olasdtr Hjornevik | 1 | Olsgard | 2 | Ober | 1 | Ogden | 1 | - | - |