| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Koharu | ko-hah-ṙoo | Japanese | ||
| Koit | - | Estonian | ||
| Kojo | - | Western African, Akan | ||
| Kokoro | ko-ko-ṙo | Japanese | ||
| Komang | - | Indonesian, Balinese | ||
| Koralo | ko-RAH-lo | Esperanto | ||
| Kotone | ko-to-ne | Japanese | ||
| Kouki | ko:-kee | Japanese | ||
| Kouta | ko:-tah | Japanese | ||
| Krisna | KREES-nah | Indonesian | ||
| Kristiina | KREES-tee:-nah (Finnish) | Finnish, Estonian | ||
| Kristina | kris-TEE-nah (German) | Swedish, Norwegian, Danish, Russian, German, Slovene, Czech, Lithuanian, Serbian, Croatian, Faroese, | ||
| Kristjan | - | Estonian, Slovene | ||
| Kumar | - | Indian, Hindi, Marathi, Bengali, Assamese, Odia, Gujarati, Punjabi, Tamil, Telugu, Malayalam, Kannad | ||
| Kumiko | koo-mee-ko | Japanese |