| JÁKup | | - | Faroese | |
| JÓAnnes | | - | Faroese | |
| JÓHannes | | - | Icelandic, Faroese | |
| JÓN | | - | Icelandic, Faroese | |
| JÔNatas | | - | Portuguese | |
| JÚLia | | ZHOO-lyə (Portuguese), YOO-lee-aw (Hungarian) | Portuguese, Catalan, Hungarian, Slovak | |
| Jaagup | | - | Estonian | |
| Jaak | | - | Estonian, Flemish | |
| Jaakob | | - | Finnish (Rare), Estonian (Rare) | |
| Jaan | | - | Estonian | |
| JacÓ | | - | Portuguese | |
| Jacinta | | hah-THEEN-tah (Spanish), hah-SEEN-tah (Latin American Spanish) | Spanish, Portuguese | |
| Jacinto | | hah-THEEN-to (Spanish), hah-SEEN-to (Latin American Spanish) | Spanish, Portuguese | |
| Jaime (1) | | HIE-me (Spanish), ZHIEM (Portuguese) | Spanish, Portuguese | |
| Jamyang | | - | Tibetan, Bhutanese | |