| GILL f English |
| GILLIAN f English |
| GIULIA f Italian |
| GIULIANA f Italian |
| GIULIANO m Italian |
| GIULIETTA f Italian |
| GIULIO m Italian |
| GYULA m Hungarian |
| IOVIS m Roman Mythology |
| IOVITA m & f Ancient Roman |
| IÚILE f Irish |
| IULIA f Romanian, Ancient Roman |
| IULIAN m Romanian |
| IULIANA f Romanian, Ancient Roman |
| IULIANUS m Ancient Roman |
| IULIU m Romanian |
| IULIUS m Ancient Roman |
| IUPPITER m Roman Mythology |
| JILL f English |
| JILLIAN f English |
| JILLIE f English |
| JILLY f English |
| JOLYON m English (Rare) |
| JOOLS m & f English |
| JOVE m Roman Mythology (Anglicized) |
| JOVITA f Spanish, Portuguese |
| JOWITA f Polish |
| JULEK m Polish |
| JULEN m Basque |
| JULES (1) m French |
| JULES (2) f & m English |
| JULI f Hungarian |
| JÚLIA f Portuguese, Hungarian, Slovak |
| JULIA f English, German, Scandinavian, Dutch, Spanish, Polish, Finnish, Ancient Roman, Biblical |
| JULIÁN m Spanish |
| JULIAN m English, Polish, German |
| JULIANA f Dutch, German, English, Spanish, Portuguese, Ancient Roman |
| JULIANE f French, German |
| JULIANNA f Hungarian, Polish, English |
| JULIANNE f English |
| JULIE f French, English |
| JULIEN m French |
| JULIENNE f French |
| JULIET f English |
| JULIETTE f French |
| JULIJ m Slovene |
| JULIJA f Slovene, Croatian, Lithuanian |
| JULIJANA f Slovene, Croatian, Macedonian |
| JULINHA f Portuguese |
| JULIO m Spanish, Portuguese |
| JULISKA f Hungarian |
| JULITA f Polish |
| JULITTA f History |
| JÚLIUS m Slovak |
| JULIUS m Ancient Roman, English, German |
| JULIUSZ m Polish |
| JULYAN m English (Rare) |
| JUPITER m Roman Mythology (Anglicized) |
| LIANA f Italian, Portuguese, English |
| LIANE f German |
| ULIANA f Russian |
| YULI m Russian |
| YULIA f Russian |
| YULIAN m Russian, Bulgarian |
| YULIANA f Russian, Bulgarian |
| YULIANNA f Russian |
| YULIY m Russian |
| YULIYA f Russian, Bulgarian |
