| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 341 | Isolda | German | Rule of ice. | F | |
| 342 | Isolde | German | Variant of Isolda: Ice, rule. | F | |
| 343 | Isole | German | Rule of ice. | F | |
| 344 | Jakoba | German | Feminine form of Jakoh. | F | |
| 345 | Jakobe | German | Feminine form of Jakoh. | F | |
| 346 | Jakobie | German | Feminine form of Jakoh. | F | |
| 347 | Jocelyn | German | One of the Goths. | F | |
| 348 | Johanna | German | German form of Joanna. | F | |
| 349 | Johannah | German | Variant of Joan. | F | |
| 350 | Jolan | German | CountIy. | F | |
| 351 | Jolanka | German | CountIy. | F | |
| 352 | Joli | German | CountIy. | F | |
| 353 | Joscelin | German | START Variant of Jocelyn: One of the Goths'. Introduced into Britam as a masculine name during the Norman Conquest, Jocelyn was adopted as a feminine first name in the early 20th century. | F | |
| 354 | Josefa | German | Feminine of Joseph. | F | |
| 355 | Joss | German | Diminutive of Jocelyn: One of the Goths'. Introduced into Britam as a masculine name during the Norman Conquest, Jocelyn was adopted as a feminine first name in the early 20th century. | F | |
| 356 | Karla | German | Feminine form of Karl. | F | |
| 357 | Karlee | German | 'Womanly; strength.' Feminine of Karl. | F | |
| 358 | Karleen | German | 'Womanly; strength.' Feminine of Karl. | F | |
| 359 | Karleigh | German | 'Womanly; strength.' Feminine of Karl. | F | |
| 360 | Karlen | German | 'Womanly; strength.' Feminine of Karl. | F | |