| Name | Meaning | Gender | Origin |
|---|
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jerk | Ever Powerful Ruler | Unisex | Swedish |
| Jesper | Treasure | Unisex | Danish |
| Jessica | God's grace | Female | Hebrew |
| Jim | supplanter | Male | English |
| Joel | God is willing, Jehova is the Lord | Male | Hebrew |
| John | God is merciful | Male | Hebrew |
| Jon | God is gracious; or gift of Jehovah | Male | English |
| Jonas | Dove. Variant of Hebrew Jonah.
| Male | Greek |
| Jonathan | God gives | Male | Hebrew |
| Josefina | God Will Increase | Unisex | Spanish |
| Julia | Youthful
| Female | Latin |
| 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 |
| Justus | Just | Male | Roman |
| Kai | Fire
| Male | Hawaiian |
| Karen | pure | Female | Danish |
| Karin | Pure | Unisex | Greek |
| Karina | Italian, dear little one | Female | Scandinavian |
| Kasper | treasurer | Male | Persian |
| Katarina | pure | Female | Czech |
| Katerina | Blessed, Pure, Holy | Unisex | Czechoslovakian |
| Katina | Pure, Unsullied | Unisex | Greek |
| Katrina | Greek, pure | Female | |
| Kevin | handsome | Male | Irish |