| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 121 | Brac | Welsh | Free. | M | |
| 122 | Brad | Welsh | Treason. | M | |
| 123 | Bradwen | Welsh | Legendary son of Moren. | M | |
| 124 | Bradwr | Welsh | Traitor. | M | |
| 125 | Braen | Welsh | Corrupt. | M | |
| 126 | Braith | Welsh | Freckled. | F | |
| 127 | Bran | Welsh | Raven. | M | |
| 128 | Brangwen | Welsh | Dark and pure. | F | |
| 129 | Brangwy | Welsh | Dark and pure. | F | |
| 130 | Branwen | Welsh | Beautiful raven. Branwen was heroine of one of the tales of the Mabinogion. | F | |
| 131 | Branwenn | Welsh | Dark and pure. | F | |
| 132 | Branwyn | Welsh | White-breasted. | F | |
| 133 | Brathach | Welsh | Legendary son of Gwawrddur. | M | |
| 134 | Bregus | Welsh | Frail. | F | |
| 135 | Briallan | Welsh | Primrose. | F | |
| 136 | Brian | Welsh | Legendary son of Turenn. 'Strong'. | M | |
| 137 | Broderick | Welsh | Son of Roderick. | M | |
| 138 | Bronwen | Welsh | Dark and pure. White breast, white breasted. | F | |
| 139 | Bronwyn | Welsh | Dark and pure. White breast, white breasted. | F | |
| 140 | Brychan | Welsh | Speckled; spotted. | M | |