| Name | Meaning | Gender | Origin |
|---|
| Blue | Blue | Unisex | English |
| Bobby | Bright fame | Unisex | Germanic |
| Bobo | On tuesday born | Unisex | African |
| Bogey | | Unisex | Hebrew |
| Bongo | Connected drums played by beating with hands. | Unisex | English |
| Boo | | Unisex | Hebrew |
| Boomer | A large full grown kangaroo. A baby boomer. | Unisex | English |
| Boots | | Unisex | Hebrew |
| Boozer | Excessive alcoholic drinker | Unisex | English |
| Brady | Descendant of Brádach | Unisex | Gaelic |
| Brit | Strong Or From Britain | Unisex | English |
| Brooke | A brook, stream | Unisex | English |
| Brownie | Moist chocolate cake with nuts | Unisex | English |
| Bruiser | A large heavyset man | Unisex | English |
| Bubba | | Unisex | Hebrew |
| Bubbles | Thin spherical liquid filled with gas. Irrepressible activity. | Unisex | English |
| Bucky | | Unisex | Hebrew |
| Budda | | Unisex | Hebrew |
| Bug | An insect. A disease-producing microorganism. An error in coding or logic that causes a malfunction in a computer a program. An electronic listening device. An enthusiasm. Slang for annoy. | Unisex | English |
| Bugsy | | Unisex | Hebrew |
| Bullet | A metal cylinder shot from a rifle or gun. Used to express speed. | Unisex | English |
| Bullwinkle | | Unisex | Hebrew |
| Bully | An overbearing person, a ruffian | Unisex | English |
| Bumper | | Unisex | Hebrew |
| Bunky | | Unisex | Hebrew |
| Buster | One that breaks up something | Unisex | American English |
| Butch | Masculine in appearance or manner. | Unisex | American English |
| Butter | | Unisex | Hebrew |
| Buttercup | A bright yellow flowered plant. Also a term of endearment. | Unisex | English |
| Butterscotch | | Unisex | Hebrew |