| Banagher | Man | Irish Names |
| Barry | Unisex | Irish Names |
| Bary | Man | Irish Names |
| Belenus | Man | Irish Names |
| Berach | Man | Irish Names |
| Bevin | Woman | Irish Names |
| Bidelia | Woman | Irish Names |
| Bowie | Man | Irish Names |
| Boyd | Man | Irish Names |
| Boyle | Man | Irish Names |
| Bradan | Man | Irish Names |
| Brady | Unisex | Irish Names |
| Brawley | Man | Irish Names |
| Brede | Unisex | Irish Names |
| Breeda | Woman | Irish Names |
| Breena | Woman | Irish Names |
| Brend | Man | Irish Names |
| Brendan | Man | Irish Names |
| Brendon | Man | Irish Names |
| Brennan | Man | Irish Names |