| Name | Meaning | Gender | Origin |
|---|
| Hydra | | Unisex | Hebrew |
| Ian | Form of John | Male | Scottish |
| Irving | handsome, fair | Male | Scottish |
| Ivar | yew wood, archer | Male | Norse |
| Ivor | yew | Male | Scottish |
| Jackson | Son of Jack | Male | English |
| Jacky | God Is Gracious | Unisex | English |
| Jamee | supplanter, one who replaces | Unisex | |
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| Jean | God is gracious | Male | |
| Jessy | God's Gracious Gift | Unisex | Hebrew |
| Jock | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Scottish |
| Johnson | Son of John
| Male | English |
| Johnston | From John's farm
| Male | |
| Kade | From the wetlands.
| Male | Spelling |
| Kai | Fire
| Male | Hawaiian |
| Kam | Form of Cameron crooked nose.
| Male | |
| Kamden | Winding Valley. Form of Camden.
| Male | Spelling |
| Kameron | Scottish surname, crooked nose | Male | Spelling |
| Kayleigh | Slender | Unisex | English |
| Keith | wood, wind; wood-dweller | Male | Scottish |
| Kenny | English, born of fire, handsome | Male | English |
| Kinney | | Unisex | |
| Kinny | From The Top Of The Cliff | Unisex | Scottish |
| Kirk | church | Male | Norse |