| Jaagup | | - | Estonian | |
| Jaak | | - | Estonian, Flemish | |
| Jaakob | | - | Finnish (Rare), Estonian (Rare) | |
| Jaan | | - | Estonian | |
| Jelena | | - | Serbian, Croatian, Slovene, Estonian, Latvian, Lithuanian | |
| Johanna | | yo-HAH-nah (German), yo-HAHN-nah (Danish, Dutch), YO-hahn-nah (Finnish) | German, Swedish, Norwegian, Danish, Dutch, Hungarian, Finnish, Estonian, English, Late Roman | |
| Johannes | | yo-HAH-nes (German), yo-HAHN-nəs (Dutch, Danish), YO-hahn-nes (Finnish) | German, Dutch, Swedish, Norwegian, Danish, Finnish, Estonian, Late Roman | |
| Joosep | | - | Estonian | |
| Juhan | | - | Estonian | |