| Name | Meaning | Gender | Origin |
|---|
| Bootsie | Collins Pussycat | Unisex | |
| Boris | A fighter, battler | Male | Slavic |
| Bourbon | A whiskey distilled from fermented mash | Male | Word |
| Boxer | | Unisex | Hebrew |
| Bozo | A dunce or fool | Unisex | |
| Brad | English, wide meadow | Male | English |
| Bradley | broad meadow | Male | English |
| Bruce | thicket, woodlands | Male | Scottish |
| Bruno | Brown
| Male | |
| Bruno | Brown
| Male | |
| Bubbles | Thin spherical liquid filled with gas. Irrepressible activity. | Male | |
| Bubbles | Thin spherical liquid filled with gas. Irrepressible activity. | Male | |
| Bucky | | Unisex | Hebrew |
| Buddy | From Budd - The welcome messenger. | Male | English |
| Buddy | From Budd - The welcome messenger. | Male | English |
| Buffy | God's promise | Female | English |
| Bullet | A metal cylinder shot from a rifle or gun. Used to express speed. | Male | |
| Bunny | little rabbit | Female | Nickname |
| Buster | One that breaks up something | Male | Modern |
| Bustopher Jones | | Unisex | Hebrew |
| Butterscotch | | Male | Hebrew |
| Butthead | | Unisex | Hebrew |
| Buttons | | Male | Hebrew |
| Cactus | Cactus | Unisex | English |
| Cairo | City In Egypt | Male | English |