| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Koralo | ko-RAH-lo | Esperanto | ||
| Korbinian | kawr-BEE-nee-ahn | German | ||
| Kord | KAWRT | German | ||
| Korinna | - | Ancient Greek | ||
| KornÉL | KOR-nayl | Hungarian | ||
| KornÉLia | KOR-nay-lee-aw | Hungarian | ||
| Korneli | - | Georgian | ||
| Kornelia | kawr-NE-lee-ah (German), kawr-NEL-yah (Polish) | German, Polish | ||
| Kornelija | - | Croatian, Serbian | ||
| Kosmas | - | Ancient Greek | ||
| Kosta | - | Bulgarian | ||
| Kostadin | - | Bulgarian, Macedonian | ||
| Kostandin | - | Albanian | ||
| Kostya | - | Russian | ||
| Kostyantyn | - | Ukrainian |