| EQUIVALENTS |
| ENGLISH: Constant |
| FRENCH: Constant |
| ITALIAN: Costanzo |
| POLISH: Konstanty |
|
| OTHER FORMS |
| ALBANIAN: Kostandin |
| BULGARIAN: Konstantin, Kosta, Kostadin |
| DUTCH: Constantijn, Stijn |
| ENGLISH: Connie, Constance |
| FRENCH: Constance, Constantin |
| GEORGIAN: Konstantine |
| GERMAN: Constanze, Konstantin, Konstanze |
| GREEK: Gus, Konstantina, Konstantinos |
| HISTORY: Constantine |
| HUNGARIAN: Konstantin |
| ITALIAN: Costantino |
| LATE ROMAN: Constantia, Constantina, Constantinus, Constantius |
| MACEDONIAN: Konstantin, Kostadin |
| POLISH: Konstancja, Konstantyn |
| PORTUGUESE: Constança, Constância |
| ROMANIAN: Constanța, Constantin, Costache, Costel, Costică, Costin, Dinu |
| RUSSIAN: Konstantin, Kostya |
| SERBIAN: Konstantin |
| SPANISH: Constanza |
| UKRAINIAN: Kostyantyn |
| WELSH: Cystennin |
|