| Adair | From the ford by the oak trees. |
| Aengus | Exceptionally strong. |
| Afric | Agreeable. |
| Africa | Agreeable. |
| Ahearn | Lord of the horses. |
| Ahern | Lord of the horses. |
| Aidan | Fire. |
| Aiden | Fire. |
| Aife | A great warrior woman of myth. |
| Aigneis | Pure. |
| Ailidh | Kind. |
| Ailill | Mythical king of Connaught. |
| Ailis | Noble. |
| Aina | Joy. |
| Aine | Fire or joy. |
| Aingeal | Angel. |
| Airell | Nobleman. |
| Airic | Agreeable. |
| Aithne | Fire. |
| Al | Diminutive 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. |
| Alain | 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. |
| 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. See also Allen. |
| Alana | Feminine form of Alan meaning harmony, stone, or noble. |
| Alane | Fair. |
| Alanna | Feminine form of Alan meaning harmony, stone, noble, or fair. |
| Alanson | Son of Allan. |
| Alastrina | Defends mankind. |
| Alastrine | Defends mankind. |
| Alastriona | Defends mankind. |
| Albion | White cliffs. Ancient poetic name for Britain. |
| Aleen | Fair, good-looking. Feminine of Allen or variant of Helen. |
| Aleena | Fair, good-looking. Feminine of Allen or variant of Helen. |
| Alena | Fair, good-looking. Feminine of Allen or variant of Helen. |
| Alene | Fair, good-looking. Feminine of Allen or variant of Helen. |
| Alice | Noble. |
| Alina | Fair. |
| Aline | Fair, good-looking. Feminine of Allen or variant of Helen. |
| Allan | 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. |
| Allen | 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. |
| Allena | Fair, good-looking. Feminine of Allen or variant of Helen. |
| Allene | Fair, good-looking. Feminine of Allen or variant of Helen. |
| Allie | Diminutive 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. |
| Ally | Diminutive 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. |
| Allyn | Handsome. |
| Alma | Good. |
| Alun | 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. |
| Alys | Noble. |
| Anant | From the stream. |
| Andraste | Victory. |
| Anghus | Exceptionally strong. |