| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 841 | Ortrude | Teutonic | Serpentine. | F | |
| 842 | Osborn | Teutonic | Divine bear. | M | |
| 843 | Osboume | Teutonic | Divine bear. | M | |
| 844 | Osgood | Teutonic | Divine creator. | M | |
| 845 | Osmond | Teutonic | God's protection. | M | |
| 846 | Osmund | Teutonic | God's protection. | M | |
| 847 | Osric | Teutonic | Divine ruler. | M | |
| 848 | Osrik | Teutonic | Divine ruler. | M | |
| 849 | Osvald | Teutonic | Divine power. | M | |
| 850 | Oswald | Teutonic | Divine power. | M | |
| 851 | Oswaldo | Teutonic | Divine power. | M | |
| 852 | Ota | Teutonic | Rich. | M | |
| 853 | Othmar | Teutonic | Happy fame. | M | |
| 854 | Otik | Teutonic | Rich. | M | |
| 855 | Oto | Teutonic | Rich. | M | |
| 856 | Otokars | Teutonic | Rich. | M | |
| 857 | Otomars | Teutonic | Rich. | M | |
| 858 | Ottilie | Teutonic | Lucky battle maiden. | F | |
| 859 | Ottillia | Teutonic | Lucky battle maiden. | F | |
| 860 | Otto | Teutonic | Wealthy. | M | |