| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Kata | KAH-tah (Finnish) | Hungarian, Finnish, Croatian | ||
| Katariina | KAH-tah-ree:-nah (Finnish) | Finnish, Estonian | ||
| Kati | KAH-tee (Finnish) | Finnish, Estonian, Hungarian | ||
| Katri | KAHT-ree | Finnish | ||
| Katriina | KAHT-ree:-nah | Finnish | ||
| Kauko | KOW-ko | Finnish | ||
| Kerttu | KERT-too | Finnish | ||
| Kielo | KEE-e-lo | Finnish | ||
| Kiira | KEE:-rah | Finnish | ||
| Kim (2) | KEEM (Finnish) | Danish, Swedish, Norwegian, Finnish | ||
| Kimi | KEE-mee | Finnish | ||
| Kirsi | KEER-see | Finnish | ||
| Kirsikka | KEER-seek-kah | Finnish | ||
| Kirsti | KEER-stee | Finnish | ||
| Klaus | KLOWS (German, Finnish) | German, Danish, Norwegian, Finnish |