| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Iunia | - | Ancient Roman, Biblical Latin | ||
| Iunius | - | Ancient Roman | ||
| Iuvenalis | - | Ancient Roman | ||
| Januarius | - | Ancient Roman | ||
| Jovian | - | Ancient Roman (Anglicized) | ||
| Juliana | yuy-lee-AH-nah (Dutch), yoo-lee-AH-nah (German), joo-lee-AHN-ə (English) | Dutch, German, English, Spanish, Portuguese, Ancient Roman | ||
| Julius | YOO:-li-uws (Ancient Roman), JOO-lee-əs (English), YOO-lee-uws (German) | Ancient Roman, English, German | ||
| Junia | - | Biblical, Ancient Roman | ||
| Junius | - | Ancient Roman | ||
| Laelia | - | Ancient Roman | ||
| Laelius | - | Ancient Roman | ||
| Laurentia | - | Ancient Roman | ||
| Laurentina | - | Ancient Roman | ||
| Laurentinus | - | Ancient Roman | ||
| Laurentius | - | Ancient Roman |