| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Kati | KAH-tee (Finnish) | Finnish, Estonian, Hungarian | ||
| Katida | kah-TEE-dah | Esperanto | ||
| Katrin | kah-TREEN (German, Swedish) | German, Swedish, Estonian | ||
| Katsu | kah-tsoo | Japanese | ||
| Katsuo | kah-tsoo-o | Japanese | ||
| Katsuro | kah-tsoo-ṙo: | Japanese | ||
| Katsurou | kah-tsoo-ṙo: | Japanese | ||
| Kayin (1) | - | Western African, Yoruba | ||
| Kayode | - | Western African, Yoruba | ||
| Kazue | kah-zoo-e | Japanese | ||
| Kazuki | kah-zoo-kee | Japanese | ||
| Kazuko | kah-zoo-ko | Japanese | ||
| Kazuo | kah-zoo-o | Japanese | ||
| Keiko | ke:-ko | Japanese | ||
| Ken (2) | ken | Japanese |