| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Onni | ON-nee | Finnish | ||
| Oona | OO-na (Irish), O:-nah (Finnish) | Irish, Finnish | ||
| Orvokki | OR-vok-kee | Finnish | ||
| Oskari | OS-kah-ree | Finnish | ||
| Osku | OS-koo | Finnish | ||
| Otso | OT-so | Finnish | ||
| Otto | AW-to (German), AH-to (English), OT-to (Finnish) | German, Swedish, Norwegian, Danish, Dutch, English, Finnish, Ancient Germanic | ||
| PÄIvÄ | PIE-va | Finnish | ||
| PÄIvi | PIE-vee | Finnish | ||
| Paavali | PAH:-vah-lee | Finnish | ||
| Paavo | PAH:-vo (Finnish) | Finnish, Estonian | ||
| Pasi | PAH-see | Finnish | ||
| 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, | ||
| Pauli | POW-lee | Finnish | ||
| Pauliina | POW-lee:-nah | Finnish |