| Name | Meaning | Gender | Origin |
|---|
| Bubble | | Unisex | Hebrew |
| Bubbles | Thin spherical liquid filled with gas. Irrepressible activity. | Unisex | English |
| Buck | He-goat | Male | English |
| Buckwheat | | Unisex | Hebrew |
| Bugsy | | Unisex | Hebrew |
| Bull | The adult male of certain large animals like cattle and elephants | Unisex | English |
| Bullet | A metal cylinder shot from a rifle or gun. Used to express speed. | Unisex | English |
| Bumper | | Unisex | Hebrew |
| Buster | One that breaks up something | Unisex | American English |
| Butch | Masculine in appearance or manner. | Unisex | American English |
| Buttercup | A bright yellow flowered plant. Also a term of endearment. | Unisex | English |
| Buttons | | Unisex | Hebrew |
| Buzz | To move quickly and busily, to bustle | Male | English |
| Byron | At the cattle sheds | Male | English |
| Cadbury | Brand of chocolate | Unisex | English |
| Caesar | Long Hair | Male | Latin |
| Cairo | Victorious one | Unisex | Arabic |
| Calico | Multi-Colored. | Unisex | English |
| Calvin | Bald | Male | French |
| Cameo | Delicate,carved relief | Unisex | English |
| Capone | | Unisex | Hebrew |
| Captain | A captain | Unisex | English |
| Caramel | A smooth chewy candy | Unisex | English |
| Carlo | Free man | Male | German |
| Carlos | Free man | Male | German |
| Cassidy | Curly | Male | Gaelic |
| Castor | Beaver | Unisex | Greek |
| Cat | Catlike | Unisex | English |
| Cecil | Blind | Male | Latin |
| Cedric | Battle Leader | Male | Literary |