| Name | Meaning | Gender | Origin |
|---|
| Irina | peace | Female | Russian |
| Iris | rainbow, a play of colours | Female | |
| Isabell | Committed to God.
| Female | |
| Isabelle | pledged to God | Female | |
| IT | | Unisex | Hebrew |
| Itty Bitty Kitty | | Female | Hebrew |
| Izzy | Salvation By God | Male | English |
| Jacques | supplanter | Male | |
| Jager | Carter | Unisex | English |
| Jaguar | Large Spotted Feline | Male | English |
| Jaione | Reference to the Nativity
| Female | |
| Jasmin | A flower name from the older form Jessamine.
| Female | |
| Javiera | Owns a new house
| Female | Spanish |
| Jean-Claude | | Unisex | Hebrew |
| Jeraldo | Variant of Gerald Rules by the spear.
| Male | |
| Jeremias | Exalted of the Lord
| Male | |
| Jerrald | Variant of Gerald Rules by the spear.
| Male | |
| Jet | A deep black colour. Aircraft engine that propels an aircraft forward by expelling exhaust gases toward the rear. | Male | Mineral |
| Jetset | | Female | |
| Johnnie | Modern feminine of John and Jon.
| Male | English |
| Jorge | Spanish form of George farmer
| Male | Spanish |
| Jorie | God will uplift
| Female | English |
| Josephine | God will increase | Female | |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Kafir | | Male | Hebrew |