| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 61 | Ap Rhys | Welsh | Son of Rhys. | M | |
| 62 | Ap Roderick | Welsh | Son of Roderick. | M | |
| 63 | Ardwyad | Welsh | Protector. | M | |
| 64 | Argel | Welsh | Refuge. | F | |
| 65 | ArgIwydd | Welsh | Lord. | M | |
| 66 | ArgIwyddes | Welsh | Lady. | F | |
| 67 | Argoel | Welsh | Omen. | F | |
| 68 | Argraff | Welsh | Impression. | F | |
| 69 | Arial | Welsh | Vigorous. | F | |
| 70 | Arian | Welsh | Silver. | F | |
| 71 | Arian | Welsh | Silver. Derived from Greek Arion, mythological magic horse born to Poseidon and Demeter. | M | |
| 72 | Ariana | Welsh | Silver. | F | |
| 73 | Arianrhod | Welsh | Legendary daughter of Don. | F | |
| 74 | Arlais | Welsh | From the temple. | F | |
| 75 | Armes | Welsh | Prophetess. | F | |
| 76 | Artaith | Welsh | Torment. | F | |
| 77 | Arthes | Welsh | She bear. | F | |
| 78 | Arthur | Welsh | Bear hero. | M | |
| 79 | Arthwr | Welsh | Bear hero. | M | |
| 80 | Arval | Welsh | Cried over. | M | |