| Isabelle | | ee-za-BEL (French), IZ-ə-bel (English), ee-sah-BEL-lə (Dutch) | French, English, German, Dutch | |
| Isaure | | - | French | |
| Isidore | | IZ-i-dawr (English), ee-zee-DOR (French) | English, French, Georgian, Jewish | |
| JÉRÉMie | | - | French | |
| JÉRÔMe | | zhe-ROM | French | |
| Jacinthe | | zha-SENT | French | |
| Jacky | | - | French | |
| Jacqueline | | zha-kə-LEEN (French), zhak-LEEN (French), JAK-ə-leen (English), JAK-ə-lin (English) | French, English | |
| Jacques | | ZHAHK | French | |
| Jacquette | | - | French (Rare) | |
| Jade | | JAYD (English) | English, French | |
| Janine | | zha-NEEN (French), jə-NEEN (English) | French, English, Dutch, German | |
| Jasmin (2) | | zhas-MEN | French (Rare) | |
| Jasmine | | JAZ-min (English), zhas-MEEN (French) | English, French | |
| Jason | | JAY-sən (English) | English, French, Greek Mythology (Anglicized), Biblical | |