| Blanka | | BLAHN-kah (Czech, Slovak, Polish, Croatian), BLAWN-kaw (Hungarian) | Czech, Slovak, Polish, Hungarian, Croatian | |
| BoŻEna | | baw-ZHE-nah | Polish | |
| BoŻYdar | | baw-ZHI-dahr | Polish | |
| Bogdan | | BAWG-dahn (Polish), BOG-dahn (Serbian, Croatian), bog-DAHN (Romanian) | Polish, Russian, Slovene, Bulgarian, Serbian, Croatian, Macedonian, Romanian, Medieval Slavic | |
| Bogdana | | bawg-DAH-nah (Polish) | Polish, Russian, Slovene, Bulgarian, Serbian, Macedonian, Romanian, Medieval Slavic | |
| Bogna | | BAWG-nah | Polish | |
| BogumiŁ | | baw-GUW-meew | Polish | |
| BogumiŁA | | baw-guw-MEE-wah | Polish | |
| BogusŁAw | | baw-GUW-swahf | Polish | |
| BogusŁAwa | | baw-guw-SWAH-vah | Polish | |
| Bolek | | BAW-lek | Polish | |
| BolesŁAw | | baw-LE-swahf | Polish | |
| BolesŁAwa | | baw-le-SWAH-vah | Polish (Rare) | |
| Bonifacy | | baw-nee-FAH-tsi | Polish | |
| Borys | | BAW-ris (Polish) | Polish, Ukrainian | |