| Jitka | | - | Czech | |
| Jo | | JO (English) | English, German, Dutch | |
| JoŠKo | | - | Croatian | |
| JoŽIca | | - | Slovene, Croatian | |
| JoËL | | zho-EL (French) | French, Dutch | |
| JoËLle | | zho-EL | French | |
| Joab | | JO-ab (English) | Biblical | |
| Joachim | | zho-a-KEEM (French), YO-ah-khim (German), yo-AH-khim (German), yaw-AH-kheem (Polish), JO-ə-kim (English) | French, German, Polish, Judeo-Christian Legend | |
| Joakim | | YO-ah-kim (Swedish), YO-ah-keem (Finnish) | Swedish, Norwegian, Danish, Finnish, Serbian, Macedonian | |
| Joan (2) | | joo-AHN (Catalan), zhoo-AHN (Catalan) | Catalan, Occitan | |
| Joana | | - | Portuguese, Catalan | |
| Joanna | | jo-AN-ə (English), yaw-AHN-nah (Polish) | English, Polish, Biblical | |
| Joanne | | jo-AN (English), zho-AN (French) | English, French | |
| Joaquim | | - | Portuguese, Catalan | |
| Joaquima | | - | Catalan | |