| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 321 | Ida | German | Labour. Active. The heroine of Tennyson's poem 'The Princess'. | F | |
| 322 | Idaia | German | Active. | F | |
| 323 | Idalie | German | Active. | F | |
| 324 | Idetta | German | Hard working. | F | |
| 325 | Idette | German | Hard working. | F | |
| 326 | Idna | German | Active. | F | |
| 327 | Ilma | German | Resolute protector. Strong helmet. Diminutive of Wilhelmina, feminine form of Wilhelm. | F | |
| 328 | Ilsa | German | Abbreviation of Elizabeth. | F | |
| 329 | Ilse | German | Oath of God. Noble. A German diminutive of the name Elizabeth. | F | |
| 330 | Ilyse | German | Noble. | F | |
| 331 | Irma | German | Universal, from the Old German 'irmin'. War goddess. | F | |
| 332 | Irmgard | German | War goddess. | F | |
| 333 | Irmigard | German | War goddess. | F | |
| 334 | Irmina | German | War goddess. | F | |
| 335 | Irmine | German | War goddess. | F | |
| 336 | Irmuska | German | War goddess. | F | |
| 337 | Isa | German | Strong willed. | F | |
| 338 | Isana | German | Strong willed. | F | |
| 339 | Isane | German | Strong willed. | F | |
| 340 | Isold | German | Rule of ice. | F | |