| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| KONSTANTIN | KAWN-stahn-teen (German), kahn-stahn-TEEN (Russian) | German, Hungarian, Russian, Serbian, Bulgarian, Macedonian | ||
| KONSTANTINA | kon-stahn-DEE-nah | Greek | ||
| KONSTANTINE | - | Georgian | ||
| KONSTANTINOS | kon-stahn-DEE-nos | Greek | ||
| KONSTANTY | kawn-STAHN-ti | Polish | ||
| KONSTANTYN | kawn-STAHN-tin | Polish | ||
| KONSTANZE | - | German | ||
| KONUL | - | Azerbaijani | ||
| KOOS | KO:S | Dutch | ||
| KOPPÁNY | - | Hungarian | ||
| KOPPEL | - | Yiddish | ||
| KORË | - | Greek Mythology | ||
| KORA | KO-rah | German | ||
| KORALIA | - | Greek, Late Greek | ||
| KORALJKA | - | Croatian |