| Apollonios | | - | Ancient Greek | |
| Appius | | AP-pi-uws (Ancient Roman), AP-ee-əs (English) | Ancient Roman | |
| Aquila | | ə-KWIL-ə (English), AK-wil-ə (English) | Biblical, Ancient Roman | |
| Aquilina | | - | Ancient Roman | |
| Aquilinus | | - | Ancient Roman | |
| Arcadius | | - | Ancient Greek (Latinized) | |
| Archelaos | | - | Ancient Greek, Biblical Greek | |
| Archelaus | | ahr-kee-LAY-əs (English) | Ancient Greek (Latinized), Biblical Latin, Biblical | |
| Archembald | | - | Ancient Germanic | |
| Archimedes | | - | Ancient Greek | |
| Archippos | | - | Ancient Greek | |
| Argyros | | - | Ancient Greek | |
| Ari (2) | | AH-ree (Finnish) | Ancient Scandinavian, Icelandic, Finnish | |
| Aristarchos | | - | Ancient Greek | |
| Aristarchus | | - | Ancient Greek (Latinized) | |