| Babylas | | - | Late Greek, French (Rare) | |
| Baghdasar | | - | Armenian (Rare) | |
| Bagrat | | - | Armenian, Georgian (Rare) | |
| Balbina | | bahl-BEE-nah (Italian) | Spanish (Rare), Portuguese (Rare), Italian (Rare), Ancient Roman | |
| Balbino | | - | Spanish (Rare), Portuguese (Rare), Italian (Rare) | |
| Balfour | | - | English (Rare) | |
| Barclay | | - | Scottish, English (Rare) | |
| Barnabas | | BAHR-nah-bahs (German), BAHR-nə-bəs (English) | German, English (Rare), Biblical, Biblical Latin, Biblical Greek | |
| Barret | | BAR-ət | English (Rare) | |
| Bartal | | - | Hungarian (Rare) | |
| Bartol | | - | Croatian (Rare) | |
| Bartolomej | | - | Slovak, Croatian (Rare) | |
| Bazyli | | bah-ZI-lee | Polish (Rare) | |
| Beatrix | | BE-ah-triks (German), BAY-ah-triks (Dutch), BEE-ə-triks (English) | German, Hungarian, Dutch, English (Rare), Late Roman | |
| Beaumont | | BO-mahnt | English (Rare) | |