| Kathy | | KATH-ee | English | |
| Kati | | KAH-tee (Finnish) | Finnish, Estonian, Hungarian | |
| Katia | | KAH-tyah | Russian | |
| Katica | | - | Croatian, Slovene, Hungarian | |
| Katida | | kah-TEE-dah | Esperanto | |
| Katie | | KAY-tee | English | |
| Katja | | KAHT-yah (German, Dutch) | German, Swedish, Norwegian, Danish, Dutch, Slovene | |
| Katka | | KAHT-kah | Czech, Slovak | |
| Katlego | | - | Southern African, Tswana | |
| Katlyn | | - | English (Modern) | |
| Kato | | - | Eastern African, Ganda | |
| Katri | | KAHT-ree | Finnish | |
| Katriina | | KAHT-ree:-nah | Finnish | |
| Katrin | | kah-TREEN (German, Swedish) | German, Swedish, Estonian | |
| Katrina | | kə-TREE-nə (English), kaht-REE-nah (Dutch) | English, German, Swedish, Dutch | |