| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| JindŘIch | - | Czech | ||
| Jitka | - | Czech | ||
| Johana | - | Czech | ||
| Jolana | - | Czech, Slovak | ||
| JonÁŠ | - | Czech, Slovak | ||
| Josef | YO-zef (German) | German, Swedish, Norwegian, Danish, Czech | ||
| Josefa | ho-SE-fah (Spanish) | Spanish, Portuguese, Czech | ||
| Judita | - | Lithuanian, Czech, Slovak | ||
| Julie | zhuy-LEE (French), YOO-lee-e (Danish), YUW-lye (Czech), JOO-lee (English) | French, Danish, Norwegian, Czech, English, German, Dutch, Spanish, Portuguese | ||
| JustÝNa | - | Czech | ||
| Justina | jus-TEE-nə (English) | English, Slovene, Czech, Lithuanian, Late Roman |