| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 401 | Athan | Greek | Immortal. | M | |
| 402 | Athanasia | Greek | Immortal. | F | |
| 403 | Athanasios | Greek | Noble. | M | |
| 404 | Athanasius | Greek | Immortal. | M | |
| 405 | Athena | Greek | Goddess of wisdom. | F | |
| 406 | Athene | Greek | Athene was the goddess of war and wisdom, after whom the city Athens was named. | F | |
| 407 | Atlanta | Greek | A huntress. | F | |
| 408 | Atlas | Greek | A Titan. | M | |
| 409 | Atreides | Greek | Descended from Atreus. | M | |
| 410 | Atreus | Greek | Father of Agamemnon in ancient Greek mythology. | M | |
| 411 | Atropes | Greek | A Fate. | F | |
| 412 | Attis | Greek | Son of Manes. | M | |
| 413 | Augustina | Greek | The feminine form of Augustine. | F | |
| 414 | Aundrea | Greek | Feminine of Andrew. | F | |
| 415 | Aura | Greek | Soft breeze. | F | |
| 416 | Aure | Greek | Soft breeze. | F | |
| 417 | Autolycus | Greek | Son of Hermes. | M | |
| 418 | Autonoe | Greek | Mother of Actaeon. | F | |
| 419 | Avernus | Greek | Portal to Hades. | M | |
| 420 | Azalea | Greek | Dry. A flower name. | F | |