| Joaquim | | - | Portuguese, Catalan | |
| Joel | | JOL (English), JO-əl (English), ho-EL (Spanish), zhoo-EL (Portuguese), YO-el (Swedish, Finnish) | English, Spanish, Portuguese, Swedish, Finnish, Biblical | |
| JordÃO | | - | Portuguese | |
| Jordana | | hor-DAH-nah (Spanish), jawr-DAN-ə (English) | Spanish, Portuguese, Macedonian, English (Rare) | |
| Jorge | | HOR-khe (Spanish), ZHAWR-zhə (Portuguese) | Spanish, Portuguese | |
| Jorginho | | - | Portuguese | |
| JosÉ | | ho-SE (Spanish), zhoo-ZE (Portuguese) | Spanish, Portuguese | |
| Josefa | | ho-SE-fah (Spanish) | Spanish, Portuguese, Czech | |
| Josefina | | ho-se-FEE-nah (Spanish), zhoo-zə-FEE-nə (Portuguese), yoo-se-FEE-nah (Swedish) | Spanish, Portuguese, Swedish | |
| JosuÉ | | ho-SWE (Spanish), zho-zoo-E (Portuguese) | French, Spanish, Portuguese | |
| Jovita | | ho-VEE-tah (Spanish) | Spanish, Portuguese | |
| Judite | | zhoo-DEE-tə (Portuguese), zhoo-JEE-chə (Brazilian Portuguese) | Portuguese | |
| Juliana | | yuy-lee-AH-nah (Dutch), yoo-lee-AH-nah (German), joo-lee-AHN-ə (English) | Dutch, German, English, Spanish, Portuguese, Ancient Roman | |
| Julie | | zhuy-LEE (French), YOO-lee-e (Danish), YUW-lye (Czech), JOO-lee (English) | French, Danish, Norwegian, Czech, English, German, Dutch, Spanish, Portuguese | |
| Julinha | | - | Portuguese | |