| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Jonquil | JAHN-kwil | English (Rare) | ||
| Jordana | hor-DAH-nah (Spanish), jawr-DAN-ə (English) | Spanish, Portuguese, Macedonian, English (Rare) | ||
| Josceline | JAHS-lin, JAHS-ə-lin | English (Rare) | ||
| Josepha | yo-ZE-fah (German) | German (Archaic), English (Rare) | ||
| Josephina | jo-sə-FEEN-ə | English (Rare) | ||
| Josslyn | JAWS-lin | English (Rare) | ||
| July | ju-LIE | English (Rare) | ||
| Julyan | JOOL-yan | English (Rare) | ||
| Juniper | JOON-ə-pər | English (Rare) | ||
| Kae | KAY | English (Rare) | ||
| Kaelea | KAY-lee | English (Rare) | ||
| Kaelee | KAY-lee | English (Rare) | ||
| Kaety | KAY-tee | English (Rare) | ||
| Kalla | KAL-ə | English (Rare) | ||
| Kalysta | kə-LIS-tə | English (Rare) |