| NAME | ORIGIN | MEANING | B/G |
| Ab-owen | Welsh | Son of Owen. | Boy |
| Aberfa | Welsh | From the mouth of the river. | Girl |
| Abertha | Welsh | Sacrifice. | Girl |
| Aberthol | Welsh | Sacrifice. | Boy |
| Adain | Welsh | Winged. | Girl |
| Adda | Welsh | Welsh form of Adam 'of the red earth'. | Boy |
| Addfwyn | Welsh | Meek. | Girl |
| Addien | Welsh | Beautiful. | Girl |
| Addiena | Welsh | Beautiful. | Girl |
| Addolgar | Welsh | Devout. | Boy |
| Adenydd | Welsh | Winged. | Girl |
| Aderyn | Welsh | Bird | Girl |
| Adwr | Welsh | Coward. | Boy |
| Adyna | Welsh | Wretched. | Girl |
| Aedd | Welsh | A king of Ireland. | Boy |
| Aelwen | Welsh | Fair Brow | Girl |
| Aelwyd | Welsh | From the hearth. | Girl |
| Aerona | Welsh | Berry | Girl |
| Alawn | Welsh | Harmony. | Boy |
| Albanwr | Welsh | From Scotland. | Boy |
| Aled | Welsh | Offspring. | Boy |
| Aledwen | Welsh | Feminine form of Aled: Offspring. | Girl |
| Amathaon | Welsh | Legendary son of Don. | Boy |
| Amerawdwr | Welsh | Emperor. | Boy |
| Amhar | Welsh | Legendary son of Arthur. | Boy |
| Amlawdd | Welsh | Legendary father of Goieuddydd. | Boy |
| Amren | Welsh | Legendary son of Bedwyr. | Boy |
| Amser | Welsh | Time. | Girl |
| Amynedd | Welsh | Patient. | Boy |
| Amyneddgar | Welsh | Patient. | Boy |