| Name | Meaning | Gender | Origin |
|---|
| Bull | The adult male of certain large animals like cattle and elephants | Unisex | |
| Bullet | A metal cylinder shot from a rifle or gun. Used to express speed. | Male | |
| Bumble | | Male | Hebrew |
| Bumper | | Unisex | Hebrew |
| Bundle | | Unisex | Hebrew |
| Bunny | little rabbit | Female | Nickname |
| Burgundy | Region Of France, Color Of Wine | Male | English |
| Buster | One that breaks up something | Male | Modern |
| Butch | Masculine in appearance or manner. | Male | Nickname |
| Butkus | | Unisex | Hebrew |
| Buttercup | A bright yellow flowered plant. Also a term of endearment. | Female | |
| Butterfly | Butterfly | Female | English |
| Button | | Unisex | Hebrew |
| Buttons | | Male | Hebrew |
| Buzz | To move quickly and busily, to bustle | Male | Modern |
| Byron | after Lord Byron | Male | English |
| Byte | | Unisex | Hebrew |
| Cabo | | Unisex | Hebrew |
| Cactus | Cactus | Unisex | English |
| Cadbury | Brand of chocolate | Unisex | |
| Cadence | rhythm, beat | Female | Latin |
| Caesar | Title for Roman Emperors | Male | Latin |
| Cagney | Surname.
| Male | Irish |
| Cairo | City In Egypt | Male | English |
| Calico | Multi-colored.
| Female | English |