| Name | Meaning | Gender | Origin |
|---|
| Bitty | Very small. Composed of fragments. | Unisex | |
| Black Cat | | Unisex | Hebrew |
| Blaze | Lisp: stutter. Blaise Pascal was a brilliant seventeenth century child prodigy: mathematician: scientist and philosopher who invented the calculating machine and hydraulic press before dying at age thirty-nine.
| Male | Latin |
| Bo | Nickname made popular by actress Bo Derek.
| Male | Norse |
| Bogie | | Male | Hebrew |
| Bonkers | | Unisex | Hebrew |
| Boo | | Male | Hebrew |
| Boo | | Male | Hebrew |
| Boo | | Male | Hebrew |
| Boo | | Male | Hebrew |
| BooBoo | | Unisex | Hebrew |
| Booger | | Unisex | Hebrew |
| Boots | | Male | Hebrew |
| Boxer | | Unisex | Hebrew |
| Brownie | Moist chocolate cake with nuts | Unisex | |
| Bruce | thicket, woodlands | Male | Scottish |
| Brutus | heavy, dull | Male | Latin |
| Bubba | | Male | Hebrew |
| Bubba | | Male | Hebrew |
| 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 |
| Bugsy | | Male | Hebrew |