| Name | Meaning | Gender | Origin |
|---|
| John | God is merciful | Male | Hebrew |
| Johnny | the Lord is gracious | Male | English |
| Johnson | Son of John
| Male | English |
| Johnston | From John's farm
| Male | |
| Jon | God is gracious; or gift of Jehovah | Male | English |
| Jonas | Dove. Variant of Hebrew Jonah.
| Male | Greek |
| Jonathan | God gives | Male | Hebrew |
| Jones | God Will Bring | Male | Welsh |
| Jordan | The descending river, to flow | Male | Hebrew |
| Jorge | Spanish form of George farmer
| Male | Spanish |
| Jose | Jehovah increases | Male | Spanish |
| Joseph | God will increase | Male | Hebrew |
| Josh | God Saves | Unisex | English |
| JR | | Unisex | Hebrew |
| Jr. | | Unisex | Hebrew |
| 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 |
| Julio | Latin, youthful, downy-bearded | Male | Spanish |
| Julius | after Julius Caesar | Male | Latin |
| Jumbo | Unusually large person, animal or thing e.g. Jumbo Jet. From African 'jumba' meaning elephant. | Male | |
| Justin | just, true | Male | Latin |
| Kai | Fire
| Male | Hawaiian |
| Kanada | | Unisex | Hebrew |
| Kane | tribute, warrior; the doubly-accomplished, golden; man, the eastern sky; beautiful | Male | Celtic |
| Karsten | Blessed or annointed one. Alternate Spelling: Carsten. Variant of Kristian.
| Male | Spelling |
| Katayama | | Unisex | Hebrew |