| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 581 | Ion | Greek | Son of Apollo. | M | |
| 582 | Iorgas | Greek | Farmer. | M | |
| 583 | Iphides | Greek | Hercules' twin brother. | M | |
| 584 | Iphis | Greek | Hanged himself over unrequited love. | M | |
| 585 | Iphitus | Greek | Brother of Iole. | M | |
| 586 | Irus | Greek | Challenged Odysseus on his return to Ithaca. | M | |
| 587 | Isadorer | Greek | Strong gift. | M | |
| 588 | Isidore | Greek | Strong Gift. Gift of Isis (this name is Greek, even though Isis is an Egyptian deity). St Isidore of Seville tried to convert Spanish Jews to Christianity during the 7th century. | M | |
| 589 | Isidoror | Greek | Strong gift. | M | |
| 590 | Isidrro | Greek | Strong gift. | M | |
| 591 | Istvan | Greek | Victorious. | M | |
| 592 | Ivan | Greek | Glorious gift. | M | |
| 593 | Ivanetsr | Greek | Glorious gift. | M | |
| 594 | Ivankor | Greek | Glorious gift. | M | |
| 595 | Ixidorr | Greek | Strong gift. | M | |
| 596 | Ixion | Greek | Father of the centaurs. | M | |
| 597 | Jace | Greek | Variant of Jason: a healing. | M | |
| 598 | Jacinto | Greek | Hyacinth. | M | |
| 599 | Jaison | Greek | Variant of Jason: a healing. | M | |
| 600 | Jase | Greek | Variant of Jason: a healing. | M | |