| Name | Meaning | Gender | Origin |
|---|
| Hyacinth | after the character in the sitcom Keeping Up Appearances | Female | |
| Hydra | | Unisex | Hebrew |
| Hyperion | | Unisex | Hebrew |
| Iduna | | Unisex | Hebrew |
| Inari | from Japanese mythology, deity of fertility, rice, agriculture, foxes, industry, and worldly success | Unisex | |
| India | Of India | Female | English |
| Indra | God of rain and thunder | Female | Sanskrit |
| Infinity | Endless | Female | English |
| Ingrid | Ing's ride | Female | Norse |
| Ira | watchful, descendant | Male | Hebrew |
| Irene | Peace
| Female | Greek |
| Irina | peace | Female | Russian |
| Iris | rainbow, a play of colours | Female | |
| Irma | universal, complete | Female | |
| Irving | handsome, fair | Male | Scottish |
| Isabella | pledged to God | Female | Spanish |
| Isadora | gift of the moon | Female | Greek |
| Isis | throne | Female | Egyptian |
| Ivory | The hard, smooth, yellowish-white of an elephant's tusk. | Male | Word |
| Ivy | ivy plant, a wine | Female | Plant |
| Izzie | | Unisex | Hebrew |
| Jace | Hebrew, the Lord is salvation | Male | Hebrew |
| Jackie | supplanter | Female | English |
| Jacqueline | Feminine form of Jacques
| Female | |
| Jada | wise | Female | Spanish |