| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Kiyoko | kee-yo-ko | Japanese | ||
| Kiyoshi | kee-yo-shee | Japanese | ||
| Kohaku | ko-hah-koo | Japanese | ||
| Koharu | ko-hah-ṙoo | Japanese | ||
| Kokoro | ko-ko-ṙo | Japanese | ||
| Kotone | ko-to-ne | Japanese | ||
| Kouki | ko:-kee | Japanese | ||
| Kouta | ko:-tah | Japanese | ||
| Kumiko | koo-mee-ko | Japanese | ||
| Kuro | koo-ṙo: | Japanese | ||
| Kurou | koo-ṙo: | Japanese | ||
| Kyo | kyo: | Japanese | ||
| Kyou | kyo: | Japanese | ||
| Mai (2) | mah-ee | Japanese | ||
| Makoto | mah-ko-to | Japanese |