| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Gustaf | GOO-stahf (German) | Swedish, German | ||
| Gustav | GOO-stahf (German) | Swedish, Norwegian, Danish, German | ||
| Gustavo | goo-STAH-vo (Italian, Spanish) | Italian, Spanish, Portuguese | ||
| Gustavs | - | Latvian | ||
| Gusti | - | Indonesian, Balinese | ||
| GusztÁV | - | Hungarian | ||
| Gutxi | - | Basque | ||
| Gvidas | - | Lithuanian | ||
| Gwandoya | - | Eastern African, Ganda | ||
| Gwenevere | GWEN-ə-vir | English (Rare) | ||
| Gwenhwyfar | - | Welsh Mythology, Arthurian Romance | ||
| Gwenneth | - | Welsh (Rare) | ||
| Gwrtheyrn | - | Ancient Celtic | ||
| GyŐZŐ | DYUU-zuu | Hungarian | ||
| Gy&Eth;A | - | Ancient Scandinavian, Icelandic |