| Blandina | | - | Ancient Roman | |
| Blandinus | | - | Ancient Roman | |
| Blandus | | - | Ancient Roman | |
| Blasius | | - | Ancient Roman | |
| Boadicea | | - | Ancient Celtic (Latinized) | |
| Borghildr | | - | Ancient Scandinavian, Norse Mythology | |
| Boudicca | | BOO-di-kə (English) | Ancient Celtic | |
| BrÉAnainn | | - | Ancient Irish | |
| BradÁN | | - | Ancient Irish | |
| Brando | | - | Ancient Germanic | |
| Brandr | | - | Ancient Scandinavian | |
| Brennus | | BREN-əs (English) | Ancient Celtic (Latinized) | |
| Brian | | BRIE-ən (Irish, English) | Irish, English, Ancient Irish | |
| Bricius | | - | Ancient Celtic (Latinized) | |
| Brunhild | | - | Germanic Mythology, Ancient Germanic | |