| Name | Meaning | Gender | Origin |
|---|
| Jakob | Supplanter, Representative | Unisex | German |
| Jansen | Variant Of The Hebrew John Jehovah Has Been Gracious; Has Shown Favor. | Unisex | German |
| Jarvis | driver, a conqueror | Male | English |
| Jay | jaybird | Male | Latin |
| Jeffrey | pledge of peace | Male | Spelling |
| Joli | Cheerful; Pretty. | Unisex | English |
| Jorge | Spanish form of George farmer
| Male | Spanish |
| Jurgen | German form of George
| Male | |
| Jutta | Of Judea | Unisex | German |
| Kafka | jackdaw | Male | Czech |
| Kai | Fire
| Male | Hawaiian |
| Kaiser | Any of the emperors of The Holy Roman Empire, Austria or Germany | Unisex | |
| Karsten | Blessed or annointed one. Alternate Spelling: Carsten. Variant of Kristian.
| Male | Spelling |
| Kasimir | Famous, Great Destroyer | Unisex | Slavic |
| Kasper | treasurer | Male | Persian |
| Katarina | pure | Female | Czech |
| Katinka | after the character in the movie Zoolander | Unisex | |
| Katja | Pure.
| Female | |
| Katrina | Greek, pure | Female | |
| Keefer | Barrelmaker Variation of Cooper. Surname.
| Male | |
| Keifer | Barrelmaker Variation of Cooper. Surname.
| Male | |
| Kelby | Dark: dark-haired.
| Male | English |
| Kiefer | barrel-maker | Male | |
| Killian | church | Male | Irish |
| Kirsten | christian; stone church | Female | Scandinavian |