| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 21 | Alain | Celtic | Variant of Alan: Harmony, stone, or noble. Also fair, handsome. Originally a saint's name, it was reintroduced to Britain during the Norman Conquest, remained popular throughout the Middle Ages, and was revived in the 19th century. | M | |
| 22 | Alan | Celtic | Harmony, stone, or noble. Also fair, handsome. Originally a saint's name, it was reintroduced to Britain during the Norman Conquest, remained popular throughout the Middle Ages, and was revived in the 19th century. See also Allen. | M | |
| 23 | Alana | Celtic | Feminine form of Alan meaning harmony, stone, or noble. | F | |
| 24 | Alane | Celtic | Fair. | F | |
| 25 | Alanna | Celtic | Feminine form of Alan meaning harmony, stone, noble, or fair. | F | |
| 26 | Alanson | Celtic | Son of Allan. | M | |
| 27 | Alastrina | Celtic | Defends mankind. | F | |
| 28 | Alastrine | Celtic | Defends mankind. | F | |
| 29 | Alastriona | Celtic | Defends mankind. | F | |
| 30 | Albion | Celtic | White cliffs. Ancient poetic name for Britain. | M | |
| 31 | Aleen | Celtic | Fair, good-looking. Feminine of Allen or variant of Helen. | F | |
| 32 | Aleena | Celtic | Fair, good-looking. Feminine of Allen or variant of Helen. | F | |
| 33 | Alena | Celtic | Fair, good-looking. Feminine of Allen or variant of Helen. | F | |
| 34 | Alene | Celtic | Fair, good-looking. Feminine of Allen or variant of Helen. | F | |
| 35 | Alice | Celtic | Noble. | F | |
| 36 | Alina | Celtic | Fair. | F | |
| 37 | Aline | Celtic | Fair, good-looking. Feminine of Allen or variant of Helen. | F | |
| 38 | Allan | Celtic | Harmony, stone, or noble. Also fair, handsome. Originally a saint's name, it was reintroduced to Britain during the Norman Conquest, remained popular throughout the Middle Ages, and was revived in the 19th century. See also Allen. | M | |
| 39 | Allen | Celtic | Harmony, stone, or noble. Also fair, handsome. Originally a saint's name, it was reintroduced to Britain during the Norman Conquest, remained popular throughout the Middle Ages, and was revived in the 19th century. | M | |
| 40 | Allena | Celtic | Fair, good-looking. Feminine of Allen or variant of Helen. | F | |