| Katja | | KAHT-yah (German, Dutch) | German, Swedish, Norwegian, Danish, Dutch, Slovene | |
| Katlego | | - | Southern African, Tswana | |
| Kato | | - | Eastern African, Ganda | |
| KatrĖ | | - | Lithuanian | |
| KatrÍN | | - | Icelandic | |
| Katrin | | kah-TREEN (German, Swedish) | German, Swedish, Estonian | |
| Katrina | | kə-TREE-nə (English), kaht-REE-nah (Dutch) | English, German, Swedish, Dutch | |
| Katrine | | kaht-REE-ne (Danish) | Danish, Norwegian | |
| Katsiaryna | | - | Belarusian | |
| Katsu | | kah-tsoo | Japanese | |
| Katsuo | | kah-tsoo-o | Japanese | |
| Katsuro | | kah-tsoo-ṙo: | Japanese | |
| Katsurou | | kah-tsoo-ṙo: | Japanese | |
| Katya | | KAH-tyah | Russian | |
| Kaui | | - | Hawaiian | |