| Name | Meaning | Gender | Origin |
|---|
| Ingrid | Ing's ride | Female | Norse |
| Irene | Peace
| Female | Greek |
| Iris | rainbow, a play of colours | Female | |
| Isabella | pledged to God | Female | Spanish |
| Isabelle | pledged to God | Female | |
| Jakob | Supplanter, Representative | Unisex | German |
| Jarl | Noble | Unisex | Norwegian |
| Jasmine | Flower
| Female | Persian |
| Jeanette | French variation of Jean, God is gracious | Female | |
| Jennie | English, God's gracious gift | Female | English |
| Jennifer | white shadow, white wave | Female | Cornish |
| 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 |
| Josefina | God Will Increase | Unisex | Spanish |
| Julia | Youthful
| Female | Latin |
| Karen | pure | Female | Danish |
| Karin | Pure | Unisex | Greek |
| Karina | Italian, dear little one | Female | Scandinavian |
| Katarina | pure | Female | Czech |
| Katerina | Blessed, Pure, Holy | Unisex | Czechoslovakian |
| Katina | Pure, Unsullied | Unisex | Greek |
| Katrina | Greek, pure | Female | |