| Nestori | | NES-to-ree | Finnish | |
| Niilo | | NEE:-lo | Finnish | |
| Niina | | NEE:-nah | Finnish | |
| Niklas | | NIK-lahs (Swedish), NEEK-lahs (Finnish) | Swedish, Finnish, Danish, Norwegian, German | |
| Niko | | NEE-ko (Finnish) | Finnish, Croatian, Slovene | |
| Nina (1) | | NEE-nah (Russian, Italian, German, Finnish, Polish), NEE-nə (English) | Russian, Italian, English, German, French, Swedish, Norwegian, Danish, Finnish, Dutch, Polish, Slove | |
| Nooa | | NO:-ah | Finnish | |
| Noora | | NO:-rah | Finnish | |
| Nyyrikki | | - | Finnish Mythology | |
| Oili | | OY-lee | Finnish | |
| Oiva | | OY-vah | Finnish | |
| Olavi | | O-lah-vee (Finnish) | Finnish, Estonian | |
| Oliver | | AHL-ə-vər (English), AW-lee-ver (German), O-lee-ver (Finnish) | English, German, Swedish, Norwegian, Danish, Finnish, Estonian, Serbian, Croatian, Macedonian, Czech | |
| Olivia | | ə-LIV-ee-ə (English), o-LEE-vyah (Italian, Spanish), o-LEE-vee-ah (German), O-lee-vee-ah (Finnish) | English, Italian, Spanish, German, Finnish, Swedish, Norwegian, Danish | |
| Olli | | OL-lee | Finnish | |