| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Octavia | ahk-TAYV-ee-ə (English) | English, Spanish, Ancient Roman | ||
| Octavianus | - | Ancient Roman | ||
| Octavius | ahk-TAYV-ee-əs (English) | Ancient Roman | ||
| Otho | - | Ancient Roman | ||
| Ovidius | - | Ancient Roman | ||
| Paulina | pow-LEE-nah (Spanish, Polish), paw-LEEN-ə (English) | Spanish, Portuguese, Polish, Swedish, Lithuanian, English, Ancient Roman | ||
| Paulinus | - | Ancient Roman | ||
| Paulus | - | Ancient Roman, Biblical Latin | ||
| Petronia | - | Ancient Roman | ||
| Petronius | - | Ancient Roman | ||
| Plinius | - | Ancient Roman | ||
| Pompeius | - | Ancient Roman | ||
| Pompilius | - | Ancient Roman | ||
| Pomponia | - | Ancient Roman | ||
| Pomponius | - | Ancient Roman |