| Name | Meaning | Gender | Origin |
|---|
| Bear | Large mammal with large head, bulky body and coarse thick fur | Unisex | English |
| Beauty | One that is beautiful, especially a woman | Unisex | English |
| Bela | Within | Female | Hungarian |
| Bella | My God is a vow | Female | Hebrew |
| Bianca | White | Female | Italian |
| Biscuit | A cookie or cracker | Unisex | English |
| Blackjack | A leather covered hand weapon. A card game | Unisex | English |
| Blanca | White | Female | Spanish |
| Blanche | White | Female | French |
| Blaze | Stuttering | Unisex | Latin |
| Blinker | | Unisex | Hebrew |
| Blitz | | Unisex | Hebrew |
| 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 |
| 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 |
| 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 |