| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 601 | Isabel | Latin | Variant of Elizabeth. 'My God is bountiful;God of plenty.'. | M | |
| 602 | Iulus | Latin | Son of Aeneas. | M | |
| 603 | Jacobus | Latin | Supplanter. | M | |
| 604 | Janus | Latin | God of beginnings. | M | |
| 605 | Jeovani | Latin | Form of Jovan 'Father of the sky.'. | M | |
| 606 | Jeovanni | Latin | Form of Jovan 'Father of the sky.'. | M | |
| 607 | Jeovany | Latin | Form of Jovan 'Father of the sky.'. | M | |
| 608 | Jermain | Latin | Brotherly. Variant of Germaine. Singer Jermaine Jackson. | M | |
| 609 | Jermaine | Latin | Brotherly. Variant of Germaine. Singer Jermaine Jackson. | M | |
| 610 | Jermane | Latin | Brotherly. Variant of Germaine. Singer Jermaine Jackson. | M | |
| 611 | Jermayne | Latin | Brotherly. Variant of Germaine. Singer Jermaine Jackson. | M | |
| 612 | Jerolin | Latin | Holy. | M | |
| 613 | Jerome | Latin | Variant of Hieronymus: Holy name. | M | |
| 614 | Jesus | Latin | Abbreviation of Joshua from the Hebrew name Jehoshua meaning 'Jehovah is salvation.'. | M | |
| 615 | Jolyon | Latin | Variant of Julian: Youthful. Jove's child. From Latin 'Julianus'. Form of Julius and family clan name of several powerful Roman emperors. In the Middle Ages, the name Julian was used for children of either gender, but is now used as a boy's name. | M | |
| 616 | Joost | Latin | Just. | M | |
| 617 | Jorcina | Latin | Variant of Georgina. | M | |
| 618 | Josephus | Latin | May God give increase. | M | |
| 619 | Jovan | Latin | Father of the sky. Form of Jove from Jupiter. Jupiter was Roman mythological supreme deity corresponding to the Greek Zeus. | M | |
| 620 | Jovani | Latin | Form of Jovan 'Father of the sky.'. | M | |