| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Cecilija | - | Slovene, Croatian | ||
| Cila | - | Slovene, Croatian | ||
| Cilka | - | Slovene | ||
| Ciril | - | Slovene | ||
| Cirila | - | Slovene | ||
| Cvetka | - | Slovene | ||
| Cvetko | - | Slovene | ||
| Dalibor | - | Czech, Slovak, Croatian, Serbian, Slovene, Medieval Slavic | ||
| Daliborka | - | Croatian, Serbian, Slovene | ||
| Damijan | - | Slovene | ||
| Damijana | - | Slovene | ||
| Damir | DAH-meer (Croatian, Serbian) | Croatian, Serbian, Slovene | ||
| Damjan | - | Slovene, Croatian, Serbian, Macedonian | ||
| Damjana | - | Slovene, Serbian, Macedonian | ||
| Danica | - | Serbian, Croatian, Slovene, Slovak, Czech, Macedonian, English |