| Name | Meaning | Gender | Origin |
|---|
| Hilda | Battle maid
| Female | |
| Hilde | Battle-Maid | Unisex | English |
| Hildegard | Battle Penn | Unisex | German |
| Hugo | Intelligent
| Male | Latinized |
| Ida | prosperous | Female | |
| Inga | guarded by Ing | Female | Norse |
| Ingrid | Ing's ride | Female | Norse |
| Irene | Peace
| Female | Greek |
| Iris | rainbow, a play of colours | Female | |
| Isaac | laughing one | Male | Hebrew |
| Isabella | pledged to God | Female | Spanish |
| Isabelle | pledged to God | Female | |
| Ivan | Form of John | Male | Russian |
| Ivar | yew wood, archer | Male | Norse |
| Ivor | yew | Male | Scottish |
| Jack | after the Georgetown University mascot, Jack the Bulldog | Male | English |
| Jack | From John - God's gracious gift | Male | English |
| Jacob | The supplanter, held by the heel | Male | Hebrew |
| Jakob | Supplanter, Representative | Unisex | German |
| Jarl | Noble | Unisex | Norwegian |
| Jasmine | Flower
| Female | Persian |
| Javier | Born in January
| Male | Spanish |
| Jeanette | French variation of Jean, God is gracious | Female | |
| Jennie | English, God's gracious gift | Female | English |
| Jennifer | white shadow, white wave | Female | Cornish |