| Name | Meaning | Details |
|---|---|---|
| Naomh | Holy | View Details |
| Nashua | Land Between Two Rivers | View Details |
| Nil | From The Nile River | View Details |
| Nile | From The River Nile | View Details |
| Ohio | Large River | View Details |
| Oleg | Holy Light | View Details |
| Olesia | Holy | View Details |
| Olga | Holy | View Details |
| Olya | Holy | View Details |
| Oni | Born On Holy Ground | View Details |
| Overton | From The Riverbank Town | View Details |
| Paiva | River Name | View Details |
| Palmer | Holy Land Pilgrim | View Details |
| Rio | River | View Details |
| Rios | Lives Near The River | View Details |