| AGOSTINA f Italian |
| AGOSTINHO m Portuguese |
| AGOSTINO m Italian |
| ÁGOSTON m Hungarian |
| AGUSTÍ m Catalan |
| AGUSTÍN m Spanish |
| AGUSTINA f Spanish |
| AKU m Finnish |
| AUGUST m German, Polish, Scandinavian, English |
| AUGUSTA f German, Italian, Portuguese, Polish, Dutch, English, Ancient Roman |
| AUGUSTAS m Lithuanian |
| AUGUSTE m French |
| AUGUSTIJN m Dutch |
| AUGUSTÍN m Slovak, Czech |
| AUGUSTIN m French, Czech, Romanian, Croatian |
| AUGUSTINA f Ancient Roman |
| AUGUSTINAS m Lithuanian |
| AUGUSTINE (1) m English |
| AUGUSTINE (2) f French, German |
| AUGUSTINUS m Ancient Roman |
| AUGUSTO m Spanish, Italian, Portuguese |
| AUGUSTS m Latvian |
| AUGUSTUS m Ancient Roman, Dutch |
| AUGUSTYN m Polish |
| AUGUSTYNA f Polish |
| AUKUSTI m Finnish |
| AUSTEN m English (Modern) |
| AUSTIN m English |
| AUSTYN m English (Modern) |
| AVGUST m Slovene |
| AVGUSTA f Slovene |
| AVGUŠTIN m Slovene |
| AWSTIN m Welsh |
| CONNIE f English |
| CONSTANÇA f Portuguese |
| CONSTANCE f English, French |
| CONSTÂNCIA f Portuguese |
| CONSTANS m Late Roman |
| CONSTANT m French, English (Rare) |
| CONSTANTA f Romanian |
| CONSTANTIA f Late Roman |
| CONSTANTIJN m Dutch |
| CONSTANTIN m French, Romanian |
| CONSTANTINA f Late Roman |
| CONSTANTINE m History |
| CONSTANTINUS m Late Roman |
| CONSTANTIUS m Late Roman |
| CONSTANZA f Spanish |
| CONSTANZE f German |
| COSTANTINO m Italian |
| COSTANZO m Italian |
| COSTEL m Romanian |
| COSTICĂ m Romanian |
| COSTIN m Romanian |
| CYSTENNIN m Welsh |
| DINU m Romanian |
| GUS (1) m English, Scottish |
| GUS (2) m Greek |
| GUSSIE f English |
| GUSTA f Dutch |
| GUUS m Dutch |
| KONSTANCJA f Polish |
| KONSTANTIN m German, Hungarian, Russian, Serbian, Bulgarian, Macedonian |
| KONSTANTINA f Greek |
| KONSTANTINOS m Greek |
| KONSTANTY m Polish |
| KONSTANTYN m Polish |
| KONSTANZE f German |
| KOSTA m Bulgarian |
| KOSTADIN m Bulgarian |
| KOSTANDIN m Albanian |
| KOSTYA m Russian |
| KOSTYANTYN m Ukrainian |
| KUSTI m Finnish |
| STIJN m Dutch |
| TIJN m Dutch |
| TIN m Croatian |
