| Name | Meaning | Gender | Origin |
|---|
| Jax | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Modern |
| Jeffrey | pledge of peace | Male | Spelling |
| Jenson | son of Jens | Male | Scandinavian |
| Jesse | wealthy | Male | Hebrew |
| Jett | Jet Black Gem | Male | English |
| 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 |
| Joe | Abbreviation of Joseph.
| Male | English |
| Joe | Abbreviation of Joseph.
| Male | English |
| Joel | God is willing, Jehova is the Lord | Male | Hebrew |
| John | God is merciful | Male | Hebrew |
| Johnny | the Lord is gracious | Male | English |
| Jonah | Dove. In the bible Jonah was on board a ship God caused to sink: sailors traditionally use the name Jonah to personify someone who brings bad luck.
| Male | Hebrew |
| Jordan | The descending river, to flow | Male | Hebrew |
| Joseph | God will increase | Male | Hebrew |
| Josh | God Saves | Unisex | English |
| 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 |
| Julius | after Julius Caesar | Male | Latin |
| Kai | Fire
| Male | Hawaiian |
| Kane | tribute, warrior; the doubly-accomplished, golden; man, the eastern sky; beautiful | Male | Celtic |
| Kingston | From the king's village or estate King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Knight | Noble, Soldier | Male | English |
| Koa | Hawaiian for strong | Unisex | |
| Krishna | dark, black | Male | Sanskrit |
| Leland | from the meadow land | Male | English |
| Lennon | small cloak or cape | Male | Irish |