| Name | Meaning | Gender | Origin |
|---|
| Jayda | Green Gemstone | Unisex | English |
| Jennifer | white shadow, white wave | Female | Cornish |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jodie | From Judith - Admired and praised | Unisex | |
| Josephine | God will increase | Female | |
| Josette | Jehovah increases | Female | |
| Joy | From Joyce - Gay and joyful | Female | Word |
| Juju | | Unisex | Hebrew |
| Julia | Youthful
| Female | Latin |
| Juliet | youthful | Female | English |
| Justice | Just, Fairness | Female | English |
| Kacie | vigilant in war | Female | English |
| Kaiden | Fighter | Unisex | American |
| Kali | after the Indian goddess of death | Female | Sanskrit |
| Karma | Fate or destiny (Hinduism and Buddhism) | Female | Hindi |
| Kate | Pure | Female | English |
| Katie | Variant of Katherine. Pure.
| Female | English |
| Kayla | crown of laurels | Female | Arabic |
| Kaylee | Arabic and Hebrew, laurel, crown | Female | American |
| Keira | after the actress Keira Knightley | Female | Irish |
| Keiran | Little, Dark | Unisex | Celtic |
| Kellogg | | Unisex | Hebrew |
| Kimberly | Cyneburga's Royal Forest, Meadow | Female | English |
| Kismet | fate, destiny | Female | Word |