| Name | Meaning | Gender | Origin |
|---|
| Hugo | Intelligent
| Male | Latinized |
| Ignacia | Fire
| Female | Latin |
| Iliana | from Ilium or Troy | Female | Greek |
| Intaglio | | Female | |
| Isabell | Committed to God.
| Female | |
| Isold | Rule of ice
| Female | |
| Jacalyn | Feminine of Jacques derived from James and Jacob.
| Female | |
| Jacquelyn | Feminine of Jacques derived from James and Jacob.
| Female | |
| Jamaica | Isle with many springs | Female | Place-name |
| Javiera | Owns a new house
| Female | Spanish |
| Jeffery | Peaceful. Variant of Geoffrey in use since medieval times.
| Male | |
| Jeremiah | Exalted of the Lord
| Male | Hebrew |
| Jessie | wealthy | Female | Anglicized |
| Jim Mcguffin | Muggle weatherman.
| Male | |
| Joaquina | God shall establish
| Female | Spanish |
| Johnson | Son of John
| Male | English |
| Jore | God will uplift
| Male | |
| Julian | Jove's child. Form of Julius and family clan name of several powerful Roman emperors. Biblical Roman centurion Julius saved Paul's life during a hazardous voyage
| Male | English |
| Julius | after Julius Caesar | Male | Latin |
| Junky | Messy, related to junk. Meaningless junk. | Male | |
| Kafir | | Male | Hebrew |
| Kareena | Pure, innocent, female friend
| Female | |
| 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 |
| Kattrina | Pure.
| Female | |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |