| Blythe | | BLIEDH | English (Rare) | |
| Bo (1) | | - | Swedish, Danish | |
| BoŠKo | | - | Serbian, Croatian, Slovene | |
| BoŽA | | - | Serbian | |
| BoŽEna | | - | Czech, Slovak, Slovene, Croatian, Serbian | |
| BoŽIca | | - | Croatian | |
| BoŽIdar | | - | Serbian, Croatian, Slovene | |
| BoŽIdarka | | - | Serbian | |
| BoŽO | | BO-zho | Croatian, Serbian, Slovene | |
| Boadicea | | - | Ancient Celtic (Latinized) | |
| Boaz | | BO-az (English) | Biblical, Hebrew, Biblical Hebrew | |
| Boban | | - | Serbian, Macedonian | |
| Bodil | | - | Swedish, Norwegian, Danish | |
| 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 | |