| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Juturna | - | Roman Mythology | ||
| Juventas | - | Roman Mythology | ||
| Kadmos | - | Greek Mythology | ||
| Kalliope | - | Greek Mythology | ||
| Kallisto | - | Greek Mythology, Ancient Greek | ||
| Kalypso | - | Greek Mythology | ||
| Karme | - | Greek Mythology | ||
| Kassandra | kə-SAN-drə (English) | Greek Mythology, Ancient Greek, English (Modern) | ||
| Kassiopeia | - | Greek Mythology | ||
| Kastor | - | Greek Mythology | ||
| Kaveh | - | Persian, Persian Mythology | ||
| Kay (2) | - | Welsh Mythology, Arthurian Romance | ||
| Kephalos | - | Greek Mythology | ||
| Kepheus | - | Greek Mythology | ||
| Kerberos | - | Greek Mythology |