| Joakim | | YO-ah-kim (Swedish), YO-ah-keem (Finnish) | Swedish, Norwegian, Danish, Finnish, Serbian, Macedonian | |
| Johan | | YOO-ahn (Swedish) | Swedish, Norwegian, Danish, Dutch | |
| 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 | |
| Johanne | | zho-AN (French), yo-HAHN-ne (Danish) | French, Danish, Norwegian, Medieval French | |
| Johannes | | yo-HAH-nes (German), yo-HAHN-nəs (Dutch, Danish), YO-hahn-nes (Finnish) | German, Dutch, Swedish, Norwegian, Danish, Finnish, Estonian, Late Roman | |
| Jon (1) | | YOON (Swedish, Norwegian), YON (Danish, Basque) | Swedish, Norwegian, Danish, Basque | |
| Jonas (2) | | YO-nahs (German), JO-nəs (English) | Swedish, Norwegian, Danish, German, Dutch, Biblical | |
| Jonatan | | YO-nah-tahn (German) | Spanish, Swedish, Norwegian, Danish, German | |
| Jonathan | | JAHN-ə-thən (English), YO-nah-tahn (German) | English, German, Swedish, Norwegian, Danish, Dutch, French, Biblical | |
| Jone (2) | | - | Norwegian | |
| Jorun | | - | Norwegian | |
| Jorunn | | - | Norwegian | |
| Josef | | YO-zef (German) | German, Swedish, Norwegian, Danish, Czech | |
| Josefine | | yo-se-FEEN (Swedish), yo-ze-FEE-nə (German) | Swedish, Danish, Norwegian, German | |
| Judit | | YOO-deet (Hungarian) | Hungarian, Spanish, Swedish, Norwegian, Danish | |