| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| 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 | ||
| Patrik | - | Swedish, Czech, Slovak, Croatian, Hungarian | ||
| Pavao | - | Croatian | ||
| Pavica | - | Croatian | ||
| Pavle | - | Serbian, Macedonian, Croatian, Georgian | ||
| Pavo | - | Croatian | ||
| Pejo | - | Croatian, Serbian | ||
| Perica | PE-ree-tsah | Croatian, Serbian | ||
| Pero | - | Serbian, Croatian |