| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 121 | Blaine | Irish | Thin. Surname. | M | |
| 122 | Blair | Irish | From the fields. | M | |
| 123 | Blar | Irish | From the fields. | M | |
| 124 | Blathma | Irish | Flower. | M | |
| 125 | Blian | Irish | Thin. | M | |
| 126 | Boetius | Irish | Foolish pride. | M | |
| 127 | Bohannon | Irish | Son of Owen. | M | |
| 128 | Boine | Irish | Variant of Boyne: White cow. | M | |
| 129 | Bowie | Irish | Surname. | M | |
| 130 | Boyn | Irish | Variant of Boyne: White cow. | M | |
| 131 | Boyne | Irish | White cow. | M | |
| 132 | Boynton | Irish | From the town by the river Boyn. | M | |
| 133 | Bradaigh | Irish | Spirited. | M | |
| 134 | Braddon | Irish | Broad hillside. | M | |
| 135 | Braden | Irish | Broad hillside. | M | |
| 136 | Bradon | Irish | Broad hillside. | M | |
| 137 | Brady | Irish | Spirited; Broad. | M | |
| 138 | Braeden | Irish | Broad hillside. | M | |
| 139 | Braedon | Irish | Broad hillside. | M | |
| 140 | Bram | Irish | Irish form of Abraham. | M | |