| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| JÖRgen | - | Swedish | ||
| JÚLia | ZHOO-lyə (Portuguese), YOO-lee-aw (Hungarian) | Portuguese, Catalan, Hungarian, Slovak | ||
| JÚLius | - | Slovak | ||
| JaŠA | - | Slovene | ||
| Jaagup | - | Estonian | ||
| Jaak | - | Estonian, Flemish | ||
| Jaakkima | YAH:K-kee-mah | Finnish | ||
| Jaakko | YAH:K-ko | Finnish | ||
| Jaakob | - | Finnish (Rare), Estonian (Rare) | ||
| Jaakoppi | YAH:-kop-pee | Finnish (Rare) | ||
| Jaan | - | Estonian | ||
| Jaana | YAH:-nah | Finnish | ||
| JacÓ | - | Portuguese | ||
| Jace | JAYS | English | ||
| Jacek | YAH-tsek | Polish |