| 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 | |
| Krista | | KRIS-tah (German), KRIS-tə (English), KREES-tah (Finnish) | German, English, Finnish | |
| Kristian | | KREES-tyahn (Swedish), KREES-tee-ahn (Finnish) | Swedish, Norwegian, Danish, Finnish | |