| Name | Meaning | Gender | Origin |
|---|
| Blackie | Of the colour black. | Unisex | |
| Blackjack | A leather covered hand weapon. A card game | Unisex | |
| Bo | Nickname made popular by actress Bo Derek.
| Male | Norse |
| Bob | bright, famous | Male | English |
| Bobbie | Latin, foreign woman | Female | English |
| Bonbon | | Unisex | Hebrew |
| Bonzo | | Male | Hebrew |
| Boots | | Male | Hebrew |
| Bosco | | Male | Hebrew |
| Bounty | | Unisex | Hebrew |
| Brandy | An alcoholic liquor distilled from wine | Female | Dutch |
| Bret | Native of Brittany | Unisex | |
| Brew | | Unisex | Hebrew |
| Brewster | brewer | Male | English |
| Briquette | | Unisex | Hebrew |
| Brodie | From Brodie
| Male | Scottish |
| Brownie | Moist chocolate cake with nuts | Unisex | |
| Bruno | Brown
| Male | |
| Bruno | Brown
| Male | |
| Brutus | heavy, dull | Male | Latin |
| Bud | herald, to puff up, friend | Male | English |
| Buddy | From Budd - The welcome messenger. | Male | English |
| Buddy | From Budd - The welcome messenger. | Male | English |
| Budweiser | Brand of American beer | Unisex | |
| Buffy | God's promise | Female | English |