| Blago | | - | Croatian | |
| Blagoje | | - | Serbian, Croatian | |
| Blanka | | BLAHN-kah (Czech, Slovak, Polish, Croatian), BLAWN-kaw (Hungarian) | Czech, Slovak, Polish, Hungarian, Croatian | |
| BoŠKo | | - | Serbian, Croatian, Slovene | |
| BoŽEna | | - | Czech, Slovak, Slovene, Croatian, Serbian | |
| BoŽIca | | - | Croatian | |
| BoŽIdar | | - | Serbian, Croatian, Slovene | |
| BoŽO | | BO-zho | Croatian, Serbian, Slovene | |
| Bogdan | | BAWG-dahn (Polish), BOG-dahn (Serbian, Croatian), bog-DAHN (Romanian) | Polish, Russian, Slovene, Bulgarian, Serbian, Croatian, Macedonian, Romanian, Medieval Slavic | |
| Bojan | | BO-yahn (Serbian, Croatian, Macedonian) | Serbian, Croatian, Slovene, Macedonian | |
| Bojana | | - | Slovene, Macedonian, Serbian, Croatian | |
| Boris | | bah-REES (Russian), BO-ris (German), BAWR-is (English) | Bulgarian, Russian, Slovene, Croatian, Serbian, Macedonian, Georgian, German, History | |
| Borislav | | bah-ree-SLAHF (Russian) | Bulgarian, Serbian, Croatian, Slovene, Russian, Medieval Slavic | |
| Borko | | - | Croatian, Serbian, Macedonian | |
| Borna | | - | Croatian | |