| Jaakob | | - | Finnish (Rare), Estonian (Rare) | |
| Jaakoppi | | YAH:-kop-pee | Finnish (Rare) | |
| Jaana | | YAH:-nah | Finnish | |
| Jalmari | | YAHL-mah-ree | Finnish | |
| Jalo | | YAH-lo | Finnish | |
| Jami (2) | | YAH-mee | Finnish | |
| Jani | | YAH-nee (Finnish) | Finnish, Hungarian | |
| Janina | | yah-NEE-nah (Polish, German), YAH-nee-nah (Finnish) | Polish, Finnish, German, Swedish, Lithuanian | |
| Janna | | YAHN-nah (Dutch, Finnish), JAN-ə (English) | Dutch, Swedish, Finnish, English | |
| Janne (1) | | YAHN-ne | Finnish, Swedish | |
| Jari | | YAH-ree | Finnish | |
| Jarkko | | YAHRK-ko | Finnish | |
| Jarmo | | YAHR-mo | Finnish | |
| Jaska | | YAHS-kah | Finnish | |
| Jenna | | JEN-ə (English), YEN-nah (Finnish) | English, Finnish | |