| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 21 | Airleas | Gaelic | Oath. | F | |
| 22 | Airleas | Gaelic | Pledge. | M | |
| 23 | Al | Gaelic | Diminutive of Alistair: A Scottish Gaelic variant of Alexander from the Greek meaning defender of man. | M | |
| 24 | Alai | Gaelic | Defender of man. | M | |
| 25 | Alain | Gaelic | Bright. | F | |
| 26 | Alana | Gaelic | This name of uncertain origin may be a feminine form of Man, or derived from the Irish Gaelic word for 'child'. | F | |
| 27 | Alanna | Gaelic | This name of uncertain origin may be a feminine form of Man, or derived from the Irish Gaelic word for 'child'. | F | |
| 28 | Alasdair | Gaelic | A Scottish Gaelic variant of Alexander from the Greek meaning defender of man. | M | |
| 29 | Alastair | Gaelic | Variant of Alexander defender of mankind. | M | |
| 30 | Alaster | Gaelic | Defender of man. | M | |
| 31 | Alayne | Gaelic | Bright. | F | |
| 32 | Alina | Gaelic | Bright. | F | |
| 33 | Alistair | Gaelic | A Scottish Gaelic variant of Alexander from the Greek meaning defender of man. | M | |
| 34 | Alistaire | Gaelic | Variant of Alexander defender of mankind. | M | |
| 35 | Alister | Gaelic | Variant of Alexander defender of mankind. | M | |
| 36 | Allene | Gaelic | Bright. | F | |
| 37 | Allie | Gaelic | Diminutive of Alistair: A Scottish Gaelic variant of Alexander from the Greek meaning defender of man. | M | |
| 38 | Allister | Gaelic | Defender of man. | M | |
| 39 | Ally | Gaelic | Diminutive of Alistair: A Scottish Gaelic variant of Alexander from the Greek meaning defender of man. | M | |
| 40 | Allyn | Gaelic | Bright. | F | |