| Jacinto | | hah-THEEN-to (Spanish), hah-SEEN-to (Latin American Spanish) | Spanish, Portuguese | |
| Jacobo | | hah-KO-bo | Spanish | |
| Jafet | | - | Spanish | |
| Jaime (1) | | HIE-me (Spanish), ZHIEM (Portuguese) | Spanish, Portuguese | |
| Javier | | hah-VYER | Spanish | |
| Javiera | | hah-VYE-rah | Spanish | |
| Jenaro | | he-NAH-ro | Spanish | |
| Jennifer | | JEN-i-fər (English) | English, German, Dutch, Swedish, Spanish | |
| Jenny | | JEN-ee (English) | English, Swedish, Finnish, German, Dutch, Spanish | |
| JerÓNimo | | he-RO-nee-mo (Spanish) | Spanish, Portuguese | |
| JeremÍAs | | he-re-MEE-ahs | Spanish | |
| JesÚS | | he-SOOS | Spanish | |
| Jesenia | | - | Spanish (Latin American) | |
| Jessenia | | - | Spanish (Latin American) | |
| Jessica | | JES-i-kə (English) | English, French, German, Swedish, Norwegian, Danish, Italian, Spanish, Portuguese | |