| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Iacomus | - | Late Roman | ||
| Iancu | - | Romanian | ||
| Ianuarius | - | Ancient Roman | ||
| Ianus | - | Roman Mythology | ||
| Ieronimus | - | Late Roman | ||
| Igerna | - | Arthurian Romance | ||
| Ignatia | - | Late Roman | ||
| Ignatius | ig-NAY-shəs (English) | Late Roman | ||
| Igraine | - | Arthurian Romance | ||
| Ileana | - | Romanian, Spanish, Italian | ||
| Ilie | - | Romanian | ||
| Ilinca | - | Romanian | ||
| Innocentius | - | Late Roman | ||
| Ioan | - | Romanian, Welsh, Bulgarian | ||
| Ioana | - | Romanian, Bulgarian |