| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Kai (1) | KIE (German, Swedish, Finnish) | Frisian, German, Swedish, Norwegian, Danish, Finnish, Dutch | ||
| Kai (2) | KIE | Swedish | ||
| Kaia | - | Norwegian, Estonian | ||
| Kaiden | KAY-dən | English (Modern) | ||
| Kaija | KIE-yah | Finnish | ||
| Kaila | - | Yiddish | ||
| Kailee | KAY-lee | English (Modern) | ||
| Kailey | KAY-lee | English (Modern) | ||
| Kailyn | KAY-lin | English (Modern) | ||
| Kaisa | KIE-sah (Finnish) | Finnish, Estonian | ||
| Kaiser | - | Various | ||
| Kaitlin | KAYT-lin | English (Modern) | ||
| Kaitlyn | KAYT-lin | English (Modern) | ||
| Kaitlynn | KAYT-lin | English (Modern) | ||
| Kaito | kah-ee-to | Japanese |