| Name | Meaning | Gender | Origin |
|---|
| Hilda | Battle maid
| Female | |
| Hocus | | Male | |
| Hocus Pocus | | Unisex | Hebrew |
| Horror | | Unisex | Hebrew |
| Horus | Egyptian god | Male | Egyptian |
| Houdini | | Male | Hebrew |
| Hulk | | Unisex | Hebrew |
| Hyde | hide | Male | English |
| Hydra | | Unisex | Hebrew |
| Ichabod | Glory has Departed | Male | Hebrew |
| Igor | Scottish variation of Welsh Ifor, lord or English form of Scandinavian Ifar, yew | Male | Russian |
| Imp | | Unisex | Hebrew |
| India | Of India | Female | English |
| Ira | watchful, descendant | Male | Hebrew |
| Isis | throne | Female | Egyptian |
| IT | | Unisex | Hebrew |
| Ivy | ivy plant, a wine | Female | Plant |
| Jack | after the Georgetown University mascot, Jack the Bulldog | Male | English |
| Jack | From John - God's gracious gift | Male | English |
| Jack-o-Lantern | | Unisex | Hebrew |
| Jackson | Son of Jack | Male | English |
| Jacquelyn | Feminine of Jacques derived from James and Jacob.
| Female | |
| Jason | the Lord is salvation | Male | Hebrew |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |