| OlÍVia | | - | Portuguese, Slovak, Hungarian | |
| Olga | | OL-gah (Russian), AWL-gah (Polish, German) | Russian, Ukrainian, Polish, German, Swedish, Norwegian, Danish, Icelandic, Latvian, Hungarian, Itali | |
| Olimpia | | aw-LEEM-pyah (Polish) | Italian, Spanish, Romanian, Polish, Hungarian | |
| OlivÉR | | O-lee-vayr | Hungarian | |
| OrbÁN | | - | Hungarian | |
| Orsolya | | - | Hungarian | |
| OszkÁR | | - | Hungarian | |
| OttÓ | | - | Hungarian, Icelandic | |
| PÁL | | PAHL | Hungarian | |
| PÉTer | | PAY-ter | Hungarian | |
| Panna | | PAWN-naw | Hungarian | |
| Panni | | PAWN-nee | Hungarian | |
| Patrik | | - | Swedish, Czech, Slovak, Croatian, Hungarian | |
| Paula | | POW-lah (German, Finnish, Spanish, Polish, Croatian), PAWL-ə (English), POW-lə (Portuguese), PAW-oo-law (Hungarian) | German, English, Finnish, Spanish, Portuguese, Catalan, Romanian, Hungarian, Polish, Dutch, Swedish, | |
| Peti | | - | Hungarian | |