| Celtic baby names begining from A |
| 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. |
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