| Name | Meaning | Gender | Origin |
|---|
| Ivan | Form of John | Male | Russian |
| Izzy | Salvation By God | Male | English |
| Jacinto | hyacinth | Male | Spanish |
| Jago | A character in a Victorian book who battled against the odds | Male | Spanish |
| Jairo | Variant of the Hebrew Jairus Jehovah enlightens.
| Male | |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Javier | Born in January
| Male | Spanish |
| Javiero | Born in January
| Male | |
| Jax | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Modern |
| Jeraldo | Variant of Gerald Rules by the spear.
| Male | |
| Jerardo | Variant of Gerard Rules by the spear.
| Male | |
| Jeremias | Exalted of the Lord
| Male | |
| Jerico | City of the moon. Variant of Hebrew Jericho.
| Male | |
| Jerold | Variant of Gerald Rules by the spear.
| Male | |
| Jeronimo | Spanish form of Jerome saved
| Male | |
| Jerrald | Variant of Gerald Rules by the spear.
| Male | |
| Jerrold | Variant of Gerald Rules by the spear.
| Male | |
| Joaquin | Abbreviation of the Hebrew name Jehoichin meaning Jehovah has established. Joaquin Miller the colorful 19th century poet-adventurer of the American west.
| Male | Spanish |
| Jonas | Dove. Variant of Hebrew Jonah.
| Male | Greek |
| Jorge | Spanish form of George farmer
| Male | Spanish |
| Jose | Jehovah increases | Male | Spanish |
| Josefina | God Will Increase | Unisex | Spanish |
| Jovian | | Unisex | Hebrew |