| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 101 | Bedwyr | Welsh | Legendary son of Pedrawd. | M | |
| 102 | Bedyw | Welsh | Legendary son of Seithved. | M | |
| 103 | Beli Mawr | Welsh | Legendary brother in law of the Virgin Mary. | M | |
| 104 | Bendigeidfran | Welsh | Blessed raven. | M | |
| 105 | Berth | Welsh | Beautiful. | F | |
| 106 | Berth | Welsh | Legendary son of Cadwy. | M | |
| 107 | Berthog | Welsh | Wealthy. | F | |
| 108 | Berwyn | Welsh | White hair. Legendary son of Kerenhyr. | M | |
| 109 | Bettrys | Welsh | The Welsh form of the Latin Beatrix, meaning 'brings joy. | F | |
| 110 | Bevan | Welsh | Evan's son. | M | |
| 111 | Beven | Welsh | Youthful. | M | |
| 112 | Bevin | Welsh | Youthful. | M | |
| 113 | Bevon | Welsh | Variant of Bevan: Evan's son. | M | |
| 114 | Bevyn | Welsh | Youthful. | M | |
| 115 | Blathaon | Welsh | Legendary son of Mwrheth. | M | |
| 116 | Bleddyn | Welsh | Wolf hero. | M | |
| 117 | Bleidd | Welsh | Wolf. | M | |
| 118 | Blodwen | Welsh | White flower. | F | |
| 119 | Blodwyn | Welsh | White flower. | F | |
| 120 | Bowen | Welsh | Son of Owen. | M | |