| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Izaak | - | Polish | ||
| Izabela | ee-zah-BE-lah | Polish | ||
| Izabella | ee-zah-BEL-lah (Polish) | Hungarian, Polish | ||
| Izolda | ee-ZAWL-dah (Polish) | Georgian, Polish | ||
| Izydor | ee-ZI-dawr | Polish | ||
| JĘDrzej | YEND-zhay | Polish | ||
| JÓZef | YUW-zef | Polish | ||
| JÓZefa | yuw-ZEF-ah | Polish | ||
| JÓZefina | - | Polish | ||
| Jacek | YAH-tsek | Polish | ||
| Jacenty | yah-TSEN-ti | Polish (Rare) | ||
| Jadwiga | yahd-VEE-gah | Polish | ||
| Jadzia | YAH-jah | Polish | ||
| Jagienka | yah-GYEN-kah | Polish | ||
| Jagna | YAHG-nah | Polish |