| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Izidor | - | Slovene | ||
| Izrail | - | Judeo-Christian Legend | ||
| Izzy | IZ-ee | English | ||
| JÉRÉMie | - | French | ||
| JÉRÔMe | zhe-ROM | French | ||
| JÓRunnr | - | Ancient Scandinavian | ||
| JaŠA | - | Slovene | ||
| Jace | JAYS | English | ||
| Jaci | - | English | ||
| Jacinda | - | English (Rare) | ||
| Jacinth | JAY-sinth, JAS-inth | English (Rare) | ||
| Jacinthe | zha-SENT | French | ||
| Jack | JAK | English | ||
| Jackalyn | - | English (Rare) | ||
| Jacki | JAK-ee | English |