| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 561 | Hyacinth | Greek | From the flower by the same name. In Greek legend, the hyacinth sprouted from the blood of the youth Hyacinthus, who was accidentally killed by Apollo. | M | |
| 562 | Hyacinthusr | Greek | Hyacinth. | M | |
| 563 | Hyancinthe | Greek | Hyacinth. | M | |
| 564 | Hylas | Greek | Son of Theiodamas. | M | |
| 565 | Hymen | Greek | God of marriage. | M | |
| 566 | Hyperion | Greek | A Titan. | M | |
| 567 | Hypnos | Greek | God of sleep. | M | |
| 568 | Iapetus | Greek | A Titan. | M | |
| 569 | Iasion | Greek | Father of Plutus. | M | |
| 570 | Iason | Greek | Healer. | M | |
| 571 | Ibycus | Greek | A bard. | M | |
| 572 | Icarius | Greek | Gave wine to the citizens of Athens who mistook it for poison and killed him. | M | |
| 573 | Icarus | Greek | Son of Daedalus. | M | |
| 574 | Icelos | Greek | Son of Hypnos. | M | |
| 575 | Idas | Greek | An Argonaut. | M | |
| 576 | Idomeneus | Greek | A king of Crete. | M | |
| 577 | Ignatius | Greek | Fiery. Famous Bearers: St Ignatius of Antioch, martyred in the 2nd century. St Ignatius of Loyola, who founded the Jesuits in the 15th century. | M | |
| 578 | Igorr | Greek | Farmer. | M | |
| 579 | Inachus | Greek | A river god. | M | |
| 580 | Inigo | Greek | Variant of Ignatius: Fiery. Famous Bearers: St Ignatius of Antioch, martyred in the 2nd century. St Ignatius of Loyola, who founded the Jesuits in the 15th century. | M | |