| Name | Meaning | Gender | Origin |
|---|
| Hugh | bright in mind and spirit | Male | English |
| Humphrey | peaceful warrior | Male | |
| Iago | Supplanter
| Male | Welsh |
| Imogen | beloved child | Female | Celtic |
| Iris | rainbow, a play of colours | Female | |
| Isabel | concecrated to God | Female | Spanish |
| Isabella | pledged to God | Female | Spanish |
| Jack | after the Georgetown University mascot, Jack the Bulldog | Male | English |
| Jack | From John - God's gracious gift | Male | English |
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| Jessica | God's grace | Female | Hebrew |
| John | God is merciful | Male | Hebrew |
| Joseph | God will increase | Male | Hebrew |
| Julia | Youthful
| Female | Latin |
| Juliet | youthful | Female | English |
| Julius | after Julius Caesar | Male | Latin |
| Juno | queen of the heavens | Female | Latin |
| Jupiter | Zeus, Father | Male | Roman |
| Justice | Just, Fairness | Female | English |
| Kate | Pure | Female | English |
| Katherine | Pure. Used since third century A.D. Early Latin forms Katerina and Caterina became Katharine and Catherine. French Cateline and English Catlyn came into wider use during medieval period when variants multiplied.
| Female | Greek |
| Laertes | from Shakespeare's Hamlet | Unisex | |
| Lance | knight's attendant; land | Male | English |
| Lancelot | Knight of Arthur and lover of Guinevere
| Male | |
| Launcelot | Knight of Arthur and lover of Guinevere
| Male | |