| NikŠA | | - | Croatian | |
| Nika (2) | | - | Slovene, Croatian | |
| Nikica | | - | Croatian, Serbian | |
| Niko | | NEE-ko (Finnish) | Finnish, Croatian, Slovene | |
| Nikola (1) | | - | Serbian, Croatian, Slovene, Bulgarian, Macedonian, Hungarian, Czech, Basque, Medieval Slavic | |
| Nikolina | | - | Bulgarian, Croatian, Serbian, Macedonian | |
| Ninoslav | | - | Serbian, Croatian, Medieval Slavic | |
| Nives | | - | Italian, Croatian | |
| Ognjan | | - | Croatian, Serbian | |
| Ognjen | | - | Croatian, Serbian | |
| Oliver | | AHL-ə-vər (English), AW-lee-ver (German), O-lee-ver (Finnish) | English, German, Swedish, Norwegian, Danish, Finnish, Estonian, Serbian, Croatian, Macedonian, Czech | |
| Olivera | | - | Serbian, Croatian, Macedonian | |
| PaŠKal | | - | Croatian (Rare) | |
| PaŠKo | | - | Croatian | |
| Patricija | | - | Slovene, Croatian | |