| Name | Meaning | Gender | Origin |
|---|
| Jefferson | son of Jeffrey | Male | English |
| Jeffery | Peaceful. Variant of Geoffrey in use since medieval times.
| Male | |
| Jellybean | | Unisex | Hebrew |
| Jenson | son of Jens | Male | Scandinavian |
| Jeremiah | Exalted of the Lord
| Male | Hebrew |
| Jeremy | God will uplift, appointed by God | Male | English |
| Jet Black | | Unisex | |
| Jezzamyn | | Unisex | Hebrew |
| Jock | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Scottish |
| Johnston | From John's farm
| Male | |
| Johny | | Male | |
| Jorge | Spanish form of George farmer
| Male | Spanish |
| Jori | Descending
| Male | |
| Josefina | God Will Increase | Unisex | Spanish |
| Juice Box | | 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 |
| Kam | Form of Cameron crooked nose.
| Male | |
| Kamen | Rock | Unisex | Croatian |
| Kareem | noble, distinguished | Male | Arabic |
| Kashmire | | Male | Hebrew |
| Katmandu | | Male | Hebrew |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Ken And Barbie | | Unisex | Hebrew |
| Kermit | free man | Male | Irish |
| Kifalampe | | Unisex | |