| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1 | Ab Owen | Welsh | Son of Owen. | M | |
| 2 | Aberfa | Welsh | From the mouth of the river. | F | |
| 3 | Abertha | Welsh | Sacrifice. | F | |
| 4 | Aberthol | Welsh | Sacrifice. | M | |
| 5 | Adain | Welsh | Winged. | F | |
| 6 | Adara | Welsh | Catches birds. | F | |
| 7 | Adda | Welsh | Welsh form of Adam 'of the red earth'. | M | |
| 8 | Addfwyn | Welsh | Meek. | F | |
| 9 | Addien | Welsh | Beautiful. | F | |
| 10 | Addiena | Welsh | Beautiful. | F | |
| 11 | Addolgar | Welsh | Devout. | M | |
| 12 | Adenydd | Welsh | Winged. | F | |
| 13 | Adwr | Welsh | Coward. | M | |
| 14 | Adyna | Welsh | Wretched. | F | |
| 15 | Aedd | Welsh | A king of Ireland. | M | |
| 16 | Aelwyd | Welsh | From the hearth. | F | |
| 17 | Alawn | Welsh | Harmony. | M | |
| 18 | Albanwr | Welsh | From Scotland. | M | |
| 19 | Aled | Welsh | Offspring. | M | |
| 20 | Aledwen | Welsh | Feminine form of Aled: Offspring. | F | |