| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 201 | Berke | Irish | The birch tree meadow. Also see Barclay and Burke. | M | |
| 202 | Berkeley | Irish | The birch tree meadow. Also see Barclay and Burke. | M | |
| 203 | Berkley | Irish | The birch tree meadow. Also see Barclay and Burke. | M | |
| 204 | Berneen | Irish | Feminine form of Bernard: courage of a bear. | F | |
| 205 | Bevin | Irish | Singer. | F | |
| 206 | Biddy | Irish | Diminutive of Brigid: A variant of Bridget, meaning the high one or strength. Famous bearer: 6th century Irish abbess Brigid )known as St Bridget or St Bride) founded Ireland's first women's religious community. | F | |
| 207 | Bidelia | Irish | Protective. | F | |
| 208 | Bidina | Irish | Protective. | F | |
| 209 | Binean | Irish | Variant of Beanon: Good. | M | |
| 210 | Birgitta | Irish | A variant of Bridget, meaning the high one or strength. Famous bearer: 6th century Irish abbess Brigid )known as St Bridget or St Bride) founded Ireland's first women's religious community. | F | |
| 211 | Birr | Irish | From Birr. | M | |
| 212 | Blaine | Irish | Thin. Surname. | M | |
| 213 | Blair | Irish | From the fields. | M | |
| 214 | Blar | Irish | From the fields. | M | |
| 215 | Blathma | Irish | Flower. | M | |
| 216 | Blathnaid | Irish | Flower. | F | |
| 217 | Blian | Irish | Thin. | M | |
| 218 | Bluinse | Irish | White. | F | |
| 219 | Blyana | Irish | Strong. | F | |
| 220 | Boetius | Irish | Foolish pride. | M | |