| Petko | | - | Bulgarian, Macedonian | |
| Petr | | - | Czech | |
| Petra | | PET-rah (Finnish), PET-rə (English) | German, Dutch, Czech, Slovak, Slovene, Croatian, Hungarian, Swedish, Finnish, English | |
| Petre | | PE-tre (Romanian) | Romanian, Macedonian, Georgian | |
| Petronel | | - | English (Archaic) | |
| Petronella | | pe-tro-NE-lah (German) | Dutch, German, Swedish | |
| Petronia | | - | Ancient Roman | |
| Petronius | | - | Ancient Roman | |
| Petros | | - | Greek, Armenian, Biblical Greek | |
| Petru | | - | Romanian, Corsican, Old Church Slavic | |
| Petrus | | PE-truws (German) | Dutch, German, Biblical Latin | |
| Phaedrus | | - | Ancient Greek (Latinized) | |
| Phaidros | | - | Ancient Greek | |
| Phanouel | | - | Biblical Greek | |
| Phanuel | | - | Biblical, Judeo-Christian Legend | |