| Name | Meaning | Gender | Origin |
|---|
| Blizzard | Violent snowstorm | Unisex | English |
| Blodwyn | Blessed flowers | Female | Welsh |
| Blondie | Pale yellowish-brown | Unisex | French |
| Blossom | Blossom, flower | Female | English |
| Boa | | Female | Hebrew |
| Bobbie | Bright fame | Female | Germanic |
| Boo | | Unisex | Hebrew |
| Bradley | Broad wood | Male | English |
| Bram | Father of a multitude or many nations | Male | Hebrew |
| Brett | A Breton | Male | English |
| Brewster | Brewer of beer | Male | English |
| Bright | | Unisex | Hebrew |
| Brittney | Originally The Ancient Duchy Of Bretagne In France. Celtic Bretons Emigrated From France To Become The Bretons Of England. | Female | English |
| Bronwen | White-breasted | Female | Welsh |
| Bronwyn | White breast | Female | Welsh |
| Brooks | A brook, stream | Male | English |
| Brown | Brown | Male | English |
| Bubble | | Unisex | Hebrew |
| Bubbles | Thin spherical liquid filled with gas. Irrepressible activity. | Unisex | English |
| Bunny | Little rabbit | Female | English |
| Butch | Masculine in appearance or manner. | Unisex | American English |
| Butter | | Unisex | Hebrew |
| Butterfinger | | Unisex | Hebrew |
| Butters | After the character in the South Park cartoons | Unisex | English |
| Buttons | | Unisex | Hebrew |
| Cade | Round, lumpy | Male | English |
| Cadence | Rhythm | Female | English |
| Caitlin | Pure | Female | English |
| Calla | Beautiful | Female | Greek |
| Candace | Fire-white | Female | Greek |