| Name | Meaning | Gender | Origin |
|---|
| Bat | Strong | Male | Mongolian |
| Bates | A boatman | Male | English |
| Bear | Large mammal with large head, bulky body and coarse thick fur | Unisex | English |
| Beast | | Unisex | Hebrew |
| Bender | | Unisex | Hebrew |
| Benelli | | Unisex | Hebrew |
| Bernard | Bear brave | Male | Germanic |
| Bevan | Fair lady | Male | Gaelic |
| Blackjack | A leather covered hand weapon. A card game | Unisex | English |
| Blade | Wealthy Glory | Male | English |
| Blair | Plain | Male | Gaelic |
| Blaze | Stuttering | Unisex | Latin |
| Blitz | | Unisex | Hebrew |
| Bolt | | Unisex | Hebrew |
| Boomer | A large full grown kangaroo. A baby boomer. | Unisex | English |
| Bowser | | Unisex | Hebrew |
| Bram | Father of a multitude or many nations | Male | Hebrew |
| Brett | A Breton | Male | English |
| Brick | Bridge. | Male | English |
| Brock | Badger | Male | English |
| Bronson | Brown's son | Male | English |
| Bruiser | A large heavyset man | Unisex | English |
| Bruno | Armour | Male | Germanic |
| Brutus | Heavy, slow, foolish | Male | Latin |
| Buck | He-goat | Male | English |
| Bud | Brother. Nickname Used Since Medieval Times. | Male | English |
| Bugsy | | Unisex | Hebrew |
| Bullet | A metal cylinder shot from a rifle or gun. Used to express speed. | Unisex | English |
| Bully | An overbearing person, a ruffian | Unisex | English |
| Butch | Masculine in appearance or manner. | Unisex | American English |