| Name | Meaning | Gender | Origin |
|---|
| Joel | God is willing, Jehova is the Lord | Male | Hebrew |
| John | God is merciful | Male | Hebrew |
| 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 |
| Jonathan | God gives | Male | Hebrew |
| Joseph | God will increase | Male | Hebrew |
| Joshua | God is salvation
| Male | 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 |
| Julius | after Julius Caesar | Male | Latin |
| Justin | just, true | Male | Latin |
| Kahlan | after the character in Terry Goodkind's Sword of Truth novels | Unisex | |
| Kai | Fire
| Male | Hawaiian |
| Kana | Powerful | Unisex | Japanese |
| Kari | curly hair | Male | Norse |
| Kate | Pure | Female | English |
| Kathyayini | Goddess of Power
| Female | |
| Kaya | my elder sister | Female | Native |
| Kelly | Lively: aggressive.
| Female | Irish |
| Ken | Male Barbie Doll. | Male | English |
| Kendra | Blend of Ken: (royal obligation:clear water) and Sandra: (protector of man) or Andrea: (manly or masculine).
| Female | English |
| Kenji | after Michael Kenji Shinoda, from the band Linkin Park | Male | Japanese |
| Keondra | Goddess
| Female | |
| Kevin | handsome | Male | Irish |
| Killian | church | Male | Irish |
| Kingston | From the king's village or estate King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Kriangsak | | Unisex | |