| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| 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 | ||
| Jacenty | yah-TSEN-ti | Polish (Rare) | ||
| Jaci | - | English | ||
| Jacinda | - | English (Rare) | ||
| Jacinta | hah-THEEN-tah (Spanish), hah-SEEN-tah (Latin American Spanish) | Spanish, Portuguese | ||
| Jacinth | JAY-sinth, JAS-inth | English (Rare) | ||
| Jacinto | hah-THEEN-to (Spanish), hah-SEEN-to (Latin American Spanish) | Spanish, Portuguese | ||
| Jack | JAK | English | ||
| Jackalyn | - | English (Rare) |