| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Joukahainen | - | Finnish Mythology | ||
| Jouko | YO-oo-ko | Finnish | ||
| Jouni | YO-oo-nee | Finnish | ||
| Juha | YOO-hah | Finnish | ||
| Juhana | YOO-hah-nah | Finnish | ||
| Juhani | YOO-hah-nee | Finnish | ||
| Juho | YOO-ho | Finnish | ||
| Jukka | YOOK-kah | Finnish | ||
| Julia | JOO-lee-ə (English), YOO-lee-ah (German, Swedish, Danish, Finnish), HOO-lyah (Spanish), YUWL-yah (Polish), YOO-lee-yah (Russian), YOO:-lee-ah (Ancient Roman) | English, German, Swedish, Norwegian, Danish, Dutch, Spanish, Polish, Finnish, Russian, Ukrainian, An | ||
| Jussi | YOOS-see | Finnish | ||
| Juuso | YOO:-so | Finnish | ||
| Jyri | YUY-ree | Finnish | ||
| Jyrki | YUYR-kee | Finnish | ||
| Kaapo | KAH:-po | Finnish | ||
| Kaapro | KAH:P-ro | Finnish |