| 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 | |
| Jordanes | | - | Ancient Germanic | |
| Josef | | YO-zef (German) | German, Swedish, Norwegian, Danish, Czech | |
| Josefine | | yo-se-FEEN (Swedish), yo-ze-FEE-nə (German) | Swedish, Danish, Norwegian, German | |
| Joseph | | JO-səf (English), zho-ZEF (French), YO-zef (German) | English, French, German, Biblical | |
| Josepha | | yo-ZE-fah (German) | German (Archaic), English (Rare) | |
| Josephine | | JO-sə-feen (English), yo-ze-FEE-nə (German) | English, German, Dutch | |
| Jost | | - | German | |
| Judda | | - | Ancient Germanic | |
| Judith | | JOO-dith (English), zhoo-DEET (French), YOO-dit (German) | English, Jewish, French, German, Spanish, Biblical | |
| 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 | |
| Julian | | JOO-lee-ən (English), JOOL-yən (English), YUWL-yahn (Polish), YOO-lee-ahn (German) | English, Polish, German | |
| Juliana | | yuy-lee-AH-nah (Dutch), yoo-lee-AH-nah (German), joo-lee-AHN-ə (English) | Dutch, German, English, Spanish, Portuguese, Ancient Roman | |