| Name | Meaning | Gender | Origin |
|---|
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| Jane | gracious, merciful, God is gracious | Female | English |
| Janet | Variant of Jane | Female | English |
| Jay | jaybird | Male | Latin |
| Jefferson | son of Jeffrey | Male | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jeremiah | Exalted of the Lord
| Male | Hebrew |
| Jessica | God's grace | Female | Hebrew |
| Jessie | wealthy | Female | Anglicized |
| Joanna | after the character in The Rescuers Down Under cartoon | Female | English |
| Jonathan | God gives | Male | Hebrew |
| Jones | God Will Bring | Male | Welsh |
| Josefina | God Will Increase | Unisex | Spanish |
| Joseph | God will increase | Male | Hebrew |
| Josephine | God will increase | Female | |
| Josie | From Josephine - She shall add. | Female | English |
| Julep | Rosewater | Unisex | Persian |
| Jules | youthful; soft, downy | Male | |
| Julia | Youthful
| Female | Latin |
| Julie | Youthful: Jove's child. A feminine of Julian.
| Female | |
| Julius | after Julius Caesar | Male | Latin |
| Kate | Pure | Female | English |
| Katelyn | pure | Female | Spelling |
| Katherine | Pure. Used since third century A.D. Early Latin forms Katerina and Caterina became Katharine and Catherine. French Cateline and English Catlyn came into wider use during medieval period when variants multiplied.
| Female | Greek |