| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1 | Ab Owen | Welsh | Son of Owen. | M | |
| 2 | Aberthol | Welsh | Sacrifice. | M | |
| 3 | Adda | Welsh | Welsh form of Adam 'of the red earth'. | M | |
| 4 | Addolgar | Welsh | Devout. | M | |
| 5 | Adwr | Welsh | Coward. | M | |
| 6 | Aedd | Welsh | A king of Ireland. | M | |
| 7 | Alawn | Welsh | Harmony. | M | |
| 8 | Albanwr | Welsh | From Scotland. | M | |
| 9 | Aled | Welsh | Offspring. | M | |
| 10 | Alun | Welsh | From the Celtic Alan meaning harmony, stone, or noble. | M | |
| 11 | Alwin | Welsh | From Alwyn. | M | |
| 12 | Alwyn | Welsh | From Alwyn. | M | |
| 13 | Amathaon | Welsh | Legendary son of Don. | M | |
| 14 | Amerawdwr | Welsh | Emperor. | M | |
| 15 | Amhar | Welsh | Legendary son of Arthur. | M | |
| 16 | Amlawdd | Welsh | Legendary father of Goieuddydd. | M | |
| 17 | Amren | Welsh | Legendary son of Bedwyr. | M | |
| 18 | Amynedd | Welsh | Patient. | M | |
| 19 | Amyneddgar | Welsh | Patient. | M | |
| 20 | Anarawd | Welsh | Legendary father of Iddig. | M | |